list 7 sources of literature review

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Writing a Literature Review

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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.

Where, when, and why would I write a lit review?

There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.

A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.

Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.

What are the parts of a lit review?

Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.

Introduction:

• An introductory paragraph that explains what your working topic and thesis is
• A forecast of key topics or texts that will appear in the review
• Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
• Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
• Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
• Critically Evaluate: Mention the strengths and weaknesses of your sources
• Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.

Conclusion:

• Summarize the key findings you have taken from the literature and emphasize their significance
• Connect it back to your primary research question

How should I organize my lit review?

Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:

• Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
• Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
• Qualitative versus quantitative research
• Empirical versus theoretical scholarship
• Divide the research by sociological, historical, or cultural sources
• Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.

What are some strategies or tips I can use while writing my lit review?

Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .

As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.

Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:

• It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
• Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
• Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
• Read more about synthesis here.

The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.

Literature review sources

Sources for literature review can be divided into three categories as illustrated in table below. In your dissertation you will need to use all three categories of literature review sources:

Sources for literature review and examples

Generally, your literature review should integrate a wide range of sources such as:

• Books . Textbooks remain as the most important source to find models and theories related to the research area. Research the most respected authorities in your selected research area and find the latest editions of books authored by them. For example, in the area of marketing the most notable authors include Philip Kotler, Seth Godin, Malcolm Gladwell, Emanuel Rosen and others.
• Magazines . Industry-specific magazines are usually rich in scholarly articles and they can be effective source to learn about the latest trends and developments in the research area. Reading industry magazines can be the most enjoyable part of the literature review, assuming that your selected research area represents an area of your personal and professional interests, which should be the case anyways.
• Newspapers can be referred to as the main source of up-to-date news about the latest events related to the research area. However, the proportion of the use of newspapers in literature review is recommended to be less compared to alternative sources of secondary data such as books and magazines. This is due to the fact that newspaper articles mainly lack depth of analyses and discussions.
• Online articles . You can find online versions of all of the above sources. However, note that the levels of reliability of online articles can be highly compromised depending on the source due to the high levels of ease with which articles can be published online. Opinions offered in a wide range of online discussion blogs cannot be usually used in literature review. Similarly, dissertation assessors are not keen to appreciate references to a wide range of blogs, unless articles in these blogs are authored by respected authorities in the research area.

Your secondary data sources may comprise certain amount of grey literature as well. The term grey literature refers to type of literature produced by government, academics, business and industry in print and electronic formats, which is not controlled by commercial publishers. It is called ‘grey’ because the status of the information in grey literature is not certain. In other words, any publication that has not been peer reviewed for publication is grey literature.

The necessity to use grey literature arises when there is no enough peer reviewed publications are available for the subject of your study.

John Dudovskiy

Literature Review: Lit Review Sources

• Lit Review Types
• GRADE System
• Do a Lit Review
• Citation Justice
• Lit Review Sources
• AI for Research This link opens in a new window

Where do I find information for a literature review?

Research is done by...

...by way of...

...communicated through...

...and organized in...

Types of sources for a review...

• Primary source: Usually a report by the original researchers of a study (unfiltered sources)
• Secondary source: Description or summary by somebody other than the original researcher, e.g. a review article (filtered sources)
• Conceptual/theoretical: Papers concerned with description or analysis of theories or concepts associated with the topic
• Anecdotal/opinion/clinical: Views or opinions about the subject that are not research, review or theoretical (case studies or reports from clinical settings)

A Heirarchy of research information:

Source: SUNY Downstate Medical Center. Medical Research Library of Brooklyn. Evidence Based Medicine Course. A Guide to Research Methods: The Evidence Pyramid: http://library.downstate.edu/EBM2/2100.htm

Life Cycle of Publication

Click image to enlarge

Scientific information has a ‘life cycle’ of its own… it is born as an idea, and then matures and becomes more available to the public. First it appears within the so-called ‘invisible college’ of experts in the field, discussed at conferences and symposia or posted as pre-prints for comments and corrections. Then it appears in the published literature (the primary literature), often as a journal article in a peer-reviewed journal.

Researchers can use the indexing and alerting services of the secondary literature to find out what has been published in a field. Depending on how much information is added by the indexer or abstracter, this may take a few months (though electronic publication has sped up this process). Finally, the information may appear in more popular or reference sources, sometimes called the tertiary literature.

The person beginning a literature search may take this process in reverse: using tertiary sources for general background, then going to the secondary literature to survey what has been published, following up by finding the original (primary) sources, and generating their own research Idea.

(Original content by Wade Lee-Smith)

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• Last Updated: Jul 1, 2024 11:03 AM
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• What is a Literature Review? | Guide, Template, & Examples

What is a Literature Review? | Guide, Template, & Examples

Published on 22 February 2022 by Shona McCombes . Revised on 7 June 2022.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research.

There are five key steps to writing a literature review:

• Search for relevant literature
• Evaluate sources
• Identify themes, debates and gaps
• Outline the structure
• Write your literature review

A good literature review doesn’t just summarise sources – it analyses, synthesises, and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

Why write a literature review, examples of literature reviews, step 1: search for relevant literature, step 2: evaluate and select sources, step 3: identify themes, debates and gaps, step 4: outline your literature review’s structure, step 5: write your literature review, frequently asked questions about literature reviews, introduction.

• Quick Run-through
• Step 1 & 2

When you write a dissertation or thesis, you will have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

• Demonstrate your familiarity with the topic and scholarly context
• Develop a theoretical framework and methodology for your research
• Position yourself in relation to other researchers and theorists
• Show how your dissertation addresses a gap or contributes to a debate

You might also have to write a literature review as a stand-alone assignment. In this case, the purpose is to evaluate the current state of research and demonstrate your knowledge of scholarly debates around a topic.

The content will look slightly different in each case, but the process of conducting a literature review follows the same steps. We’ve written a step-by-step guide that you can follow below.

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

• Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
• Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
• Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
• Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research objectives and questions .

If you are writing a literature review as a stand-alone assignment, you will have to choose a focus and develop a central question to direct your search. Unlike a dissertation research question, this question has to be answerable without collecting original data. You should be able to answer it based only on a review of existing publications.

Make a list of keywords

Start by creating a list of keywords related to your research topic. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list if you discover new keywords in the process of your literature search.

• Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
• Body image, self-perception, self-esteem, mental health
• Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some databases to search for journals and articles include:

• Your university’s library catalogue
• Google Scholar
• Project Muse (humanities and social sciences)
• Medline (life sciences and biomedicine)
• EconLit (economics)
• Inspec (physics, engineering and computer science)

You can use boolean operators to help narrow down your search:

Read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

To identify the most important publications on your topic, take note of recurring citations. If the same authors, books or articles keep appearing in your reading, make sure to seek them out.

You probably won’t be able to read absolutely everything that has been written on the topic – you’ll have to evaluate which sources are most relevant to your questions.

For each publication, ask yourself:

• What question or problem is the author addressing?
• What are the key concepts and how are they defined?
• What are the key theories, models and methods? Does the research use established frameworks or take an innovative approach?
• What are the results and conclusions of the study?
• How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
• How does the publication contribute to your understanding of the topic? What are its key insights and arguments?
• What are the strengths and weaknesses of the research?

Make sure the sources you use are credible, and make sure you read any landmark studies and major theories in your field of research.

You can find out how many times an article has been cited on Google Scholar – a high citation count means the article has been influential in the field, and should certainly be included in your literature review.

The scope of your review will depend on your topic and discipline: in the sciences you usually only review recent literature, but in the humanities you might take a long historical perspective (for example, to trace how a concept has changed in meaning over time).

Remember that you can use our template to summarise and evaluate sources you’re thinking about using!

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It’s important to keep track of your sources with references to avoid plagiarism . It can be helpful to make an annotated bibliography, where you compile full reference information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

You can use our free APA Reference Generator for quick, correct, consistent citations.

Prevent plagiarism, run a free check.

To begin organising your literature review’s argument and structure, you need to understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

• Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
• Themes: what questions or concepts recur across the literature?
• Debates, conflicts and contradictions: where do sources disagree?
• Pivotal publications: are there any influential theories or studies that changed the direction of the field?
• Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

• Most research has focused on young women.
• There is an increasing interest in the visual aspects of social media.
• But there is still a lack of robust research on highly-visual platforms like Instagram and Snapchat – this is a gap that you could address in your own research.

There are various approaches to organising the body of a literature review. You should have a rough idea of your strategy before you start writing.

Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarising sources in order.

Try to analyse patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organise your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

• Look at what results have emerged in qualitative versus quantitative research
• Discuss how the topic has been approached by empirical versus theoretical scholarship
• Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text, your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

If you are writing the literature review as part of your dissertation or thesis, reiterate your central problem or research question and give a brief summary of the scholarly context. You can emphasise the timeliness of the topic (“many recent studies have focused on the problem of x”) or highlight a gap in the literature (“while there has been much research on x, few researchers have taken y into consideration”).

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, make sure to follow these tips:

• Summarise and synthesise: give an overview of the main points of each source and combine them into a coherent whole.
• Analyse and interpret: don’t just paraphrase other researchers – add your own interpretations, discussing the significance of findings in relation to the literature as a whole.
• Critically evaluate: mention the strengths and weaknesses of your sources.
• Write in well-structured paragraphs: use transitions and topic sentences to draw connections, comparisons and contrasts.

In the conclusion, you should summarise the key findings you have taken from the literature and emphasise their significance.

If the literature review is part of your dissertation or thesis, reiterate how your research addresses gaps and contributes new knowledge, or discuss how you have drawn on existing theories and methods to build a framework for your research. This can lead directly into your methodology section.

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a dissertation , thesis, research paper , or proposal .

There are several reasons to conduct a literature review at the beginning of a research project:

• To familiarise yourself with the current state of knowledge on your topic
• To ensure that you’re not just repeating what others have already done
• To identify gaps in knowledge and unresolved problems that your research can address
• To develop your theoretical framework and methodology
• To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your  dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the ‘Cite this Scribbr article’ button to automatically add the citation to our free Reference Generator.

McCombes, S. (2022, June 07). What is a Literature Review? | Guide, Template, & Examples. Scribbr. Retrieved 21 October 2024, from https://www.scribbr.co.uk/thesis-dissertation/literature-review/

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Literature Review: The What, Why and How-to Guide: Strategies to Finding Sources

• Literature Reviews?
• Strategies to Finding Sources
• Keeping up with Research!
• Evaluating Sources & Literature Reviews
• Organizing for Writing
• Writing Literature Review
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Useful Tool to Develop your Topic

Watch this video about Concept Mapping to become a Research Pro!

• Mind Mapping (also known as Concept Mapping) A helpful handout to show step by step how to create a concept map to map out a topic.

The Research Process

Planning : Before searching for articles or books, brainstorm to develop keywords that best describe your research question.

Searching : While searching take note of what other keywords are used to describe your topic  and use them to do more searches

     ♠ Most articles include a keyword section

     ♠ Key concepts names may change through time so make sure to check for variations

Organizing : Start organizing your results by categories/key concepts or any organizing principle that make sense for you. This will help you later when you are ready to analyze your findings

Analyzing : While reading, start making notes of key concepts and commonalities and disagreement among the research articles you find.

♠ Create a spreadsheet document to record what articles you are finding useful and why.

♠ Create fields to write summaries of articles or quotes for future citing and paraphrasing .

Writing : Synthesize your findings. Use your own voice to explain to your readers what you learned about the literature your search; its weaknesses and strengths; what is missing or ignored

Repeat : at any given time of the process you can go back to a previous step as necessary

Advanced Searching

• Boolean Searching (AND, OR, NOT): Words that help you connect your terms in a logical way for the system understand you 
• Proximity Searching (N/# or W/#): It allows you to search for two or more words that occur within a specified number of words (or fewer) of each other in the databases.
• Limiters/Filters : These are options available on the advanced page to let you control what type of document you want to search (articles), dates, language, peer-review, etc...
• Question mark (?) or a pound sign (#) for wildcard: useful when you don't know how something is spelled out, e.g. if you are looking about articles about color, if you want to find articles with the spelling colour (British English), you can use colo?r to find either spelling.
• Asterisk (*) for truncation: useful for getting results with keywords with multiple endings, e.g. comput* for computer, computers, computing , etc.
• UC Library Search Explained! Check the Search tips to better used our library catalog and articles search system
• EBSCOhost Searching Tips An useful guide about how to best search EBSCOhost databases
• ProQuest Database Search Tips An useful guide about how to best search ProQuest databases
• Are you working on an emerging topic? You are not likely to find many sources, which is good because you are trying to prove that this is a topic that needs more research. But, it is not enough to say that you found few or no articles on your topic in your field. You need to look broadly to other disciplines (also known as triangulation ) to see if your research topic has been studied from other perspectives as a way to validate the uniqueness of your research question.
• Are you working on something that has been studied extensively? Then you are going to find many sources and you will want to limit how far you want to look back. Use limiters to eliminate research that may be dated and opt to search for resources published within the last 5-10 years.
• Want to keep track of your searches , send alerts to your email when new articles in your topic are available? Create an account in any of our databases!

Following the Citation Trail!

Many databases today have special featured that show you how many times an article was cited by and by who and offer you links to those articles.

See below some recommended resources:

Web of Science consists of the following databases: 

• Arts & Humanities Citation Index
• Social Sciences Citation Index
• Science Citation Index Expanded
• Conference Proceedings Citation Index - Sciences
• Conference Proceedings Citation Index - Social Sciences and Humanities
• Book Citation Index - Science
• Book Citation Index - Social Sciences and Humanities
• Emerging Sources Citation Index
• Current Chemical Reactions
• Index Chemicus
• ProQuest Dissertations & Theses Citation Index
• Zoological Record
• Users who do not have a UCSBnet ID and password can search Google Scholar without authentication . However, you will not be able to access full text from sites that require a subscription.
• The Google Scholar link in the database list is proxied to allow UCSB users to easily access subscription resources after discovery in Google Scholar.
• In Google Scholar, expand the menu and select “Settings”
• Choose “Library links”
• Search on “university of california, santa barbara”
• Check the box for "University of California, Santa Barbara - Get it at UC" and save your preferences
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Research Methods: A Student's Comprehensive Guide: Literature Reviews

• Research Approaches
• Types of Sources
• Accessing Resources
• Evaluating Sources
• Question Crafting
• Search Strategies
• Annotated Bibliography
• Literature Reviews
• Citations This link opens in a new window

Literature Review

What is a Literature Review?  A literature review is a critical analysis of existing research related to a specific topic or research question. Rather than simply summarizing the sources, a literature review evaluates, compares, and synthesizes the literature to highlight trends, gaps, and insights that inform your research.

Purpose and Importance:  Literature reviews serve multiple key functions:

• Contextualization:  They provide background on your research topic, helping to situate your work within the broader field.
• Identification of Gaps:  A thorough review highlights areas where further research is needed, guiding your own contributions.
• Critical Evaluation:  By comparing and contrasting sources, you develop a deeper understanding of the subject and establish the credibility of your research.
• Foundation for Research:  A literature review demonstrates your knowledge of the field, forming a strong basis for your methodology and research approach.

Difference Between a Literature Review and an Annotated Bibliography:  While both a literature review and an annotated bibliography involve analyzing sources, they serve different purposes. An annotated bibliography focuses on summarizing and evaluating individual sources in isolation. In contrast, a literature review synthesizes multiple sources to form a cohesive narrative, identifying patterns, themes, and debates within the literature. The literature review also typically organizes the information thematically or methodologically rather than listing sources one by one.

Q: What is the main difference between a narrative review and a systematic review? A: A narrative review provides a broad overview of existing research on a topic, while a systematic review follows a structured methodology to identify, evaluate, and synthesize all relevant studies on a specific question.

Q: How do I choose the best type of literature review for my research? A: Consider your research question and objectives. A narrative review is suitable for broad overviews, while a systematic review is best for comprehensive analyses. A scoping review helps map out the existing literature, and a meta-analysis combines quantitative results from multiple studies.

Q: How many sources should I include in my literature review? A: The number of sources depends on your topic and the scope of your review. Generally, aim to include a comprehensive selection that represents the current state of research. Ensure sources are relevant and contribute to answering your research question.

Q: Can I include unpublished sources in my literature review? A:  Yes, including unpublished sources such as dissertations, theses, or reports can provide valuable insights and fill gaps in the published literature. Ensure these sources are credible and relevant.

Q: How do I ensure my literature review is critical and not just descriptive? A: Focus on evaluating and synthesizing the sources rather than just summarizing them. Analyze the strengths, weaknesses, and contributions of each study. Highlight trends, debates, and gaps in the literature.

Scribbr: How to Write a Literature Review

Gain valuable insights on how to write an impactful literature review with this comprehensive guide!

Scribbr: Tips for Writing a Literature Review

Explore practical tips and strategies for structuring a literature review in this detailed tutorial.

• Common Mistakes

Types of Literature Reviews

• Overview:  Provides a comprehensive summary of the research on a specific topic. It offers a broad overview of the field, summarizing the key findings and trends without a strict methodological approach.
• Purpose:  Useful for providing a general understanding of a topic, identifying major themes, and outlining the historical development of research.
• Overview:  Follows a structured and transparent methodology to identify, evaluate, and synthesize all relevant studies on a specific research question. It aims to minimize bias and provide a comprehensive overview of the evidence.
• Purpose:  Ideal for answering specific research questions by systematically collecting and analyzing data from multiple studies. It often includes a meta-analysis component to quantitatively summarize the results.
• Overview:  Maps the existing literature on a broad topic, identifying key concepts, gaps, and areas for further research. It is less focused on synthesizing results and more on exploring the extent and nature of the research.
• Purpose:  Useful for understanding the breadth of research on a topic, especially when the area is complex or emerging. It helps to clarify the scope of existing evidence and inform future research directions.
• Overview:  Uses statistical techniques to combine and analyze the results of multiple studies, providing a quantitative summary of the evidence. It aims to identify patterns and determine the overall effect.
• Purpose:  Ideal for drawing general conclusions from a body of research, especially when individual studies have varying results. It provides a higher level of statistical power and precision.

Crafting a Literature Review

• Clarify Your Research Question:  Start by articulating the specific research question or objective that your literature review will address. This will help guide your search and ensure that the review remains focused.
• Set Boundaries:  Determine the scope of your review by defining parameters such as time frame, geographical area, or specific subtopics. This helps in managing the breadth of your review and maintaining relevance.
• Utilize Academic Databases:  Access scholarly articles, books, and other research materials using databases like JSTOR, PubMed, or Google Scholar.
• Expand Your Search:  Explore references in key studies, look for gray literature, and consult library catalogs to ensure a comprehensive search.
• Categorize Sources:  Group your sources by themes, methodologies, or chronological order. This organization helps in synthesizing information and presenting a coherent review.
• Use Reference Management Tools:  Tools such as RefWorks, Zotero, or EndNote can assist in managing and sorting your sources effectively.
• Identify Patterns and Themes:  Look for recurring themes, trends, and debates within the literature. Analyze how different studies relate to one another.
• Compare and Contrast:  Evaluate the methodologies, findings, and perspectives of different sources. Highlight agreements and disagreements to provide a balanced view.
• Chronological:  Organize by the timeline of research developments.
• Thematic:  Group by themes or topics.
• Methodological:  Arrange based on research methods used.
• Create an Outline:  Develop a clear outline based on your chosen structure to guide your writing and ensure logical flow.
• Analyze, Don’t Just Summarize:  Go beyond summarizing each source. Critically analyze how each piece of literature contributes to your understanding of the topic.
• Provide Context:  Explain how the literature connects to your research question or hypothesis. Show how your work builds on or challenges existing knowledge.
• Seek Feedback:  Share your draft with peers or mentors to obtain constructive feedback.
• Edit for Clarity:  Review your work for clarity, coherence, and completeness. Ensure that your review is logically organized and free of errors.

Example of a Literature Review

To illustrate how a literature review is structured and written, here's a simplified example based on a hypothetical research topic:  The Impact of Social Media on Adolescent Mental Health.

Introduction: The introduction provides an overview of the research topic and its significance.

Social media has become an integral part of adolescents' lives, raising concerns about its impact on mental health. This literature review examines existing research on how social media use affects adolescent well-being, focusing on both positive and negative outcomes.

Body: The body of the review is organized thematically or methodologically.

Positive Impacts of Social Media:

• Social Connectivity:  Studies highlight that social media platforms enable adolescents to maintain and strengthen social connections, providing emotional support and reducing feelings of isolation (Smith, 2021; Lee & Johnson, 2022).
• Educational Benefits:  Research indicates that social media can facilitate educational opportunities and learning through online communities and resources (Adams, 2020).

Negative Impacts of Social Media:

• Mental Health Issues:  Several studies link excessive social media use with increased levels of anxiety, depression, and low self-esteem among adolescents (Brown et al., 2019; Thompson & Miller, 2021).
• Cyberbullying:  Evidence shows that social media platforms can be a breeding ground for cyberbullying, leading to significant psychological distress (Green & Taylor, 2022).

Mixed Findings:

• Variability in Effects:  Some research finds that the impact of social media on mental health varies depending on individual factors such as frequency of use, type of content consumed, and pre-existing mental health conditions (Davis, 2021; Wilson, 2022).

Discussion:   The discussion synthesizes the findings, identifies trends, and highlights gaps:

The reviewed literature reveals a complex relationship between social media and adolescent mental health. While social media can offer support and educational benefits, its negative impacts—particularly related to mental health issues and cyberbullying—are significant. Further research is needed to understand how different variables affect these outcomes and to develop strategies for mitigating negative effects.

Conclusion: The conclusion summarizes the key findings and suggests areas for future research:

In summary, social media has both positive and negative effects on adolescent mental health. Addressing these impacts requires a nuanced understanding of the various factors involved and targeted interventions to support healthy social media use. Future research should focus on longitudinal studies to better assess the long-term effects of social media on mental health.

• References:  Ensure to include a list of all sources cited. In a real review, the sources cited above would be formatted according to the appropriate citation style (e.g., APA, MLA).
• Formatting:  Use headings and subheadings to clearly organize each section of the review.

This example provides a framework for how a literature review should be structured and the type of content that should be included. It demonstrates the synthesis of various sources to present a cohesive narrative on the research topic.

Common Mistakes to Avoid

• Tip:  Ensure every source and discussion point directly relates to your research question or objective. Maintain a clear focus throughout the review.
• Tip:  Prioritize primary sources and original studies to provide a robust foundation. Use secondary sources sparingly for context or background.
• Tip:  Critically assess each study’s methodology, findings, and impact on the field. Highlight strengths and weaknesses for a balanced view.
• Tip:  Use clear headings and subheadings. Choose a logical structure (e.g., thematic, chronological) and ensure smooth transitions between sections.
• Tip:  Discuss gaps in the literature to strengthen your review and position your research within the broader field.
• Tip:  Follow the appropriate citation style meticulously. Ensure all sources are cited correctly and consistently.
• Tip:  Base conclusions on a comprehensive review of the literature. Avoid generalizations unless supported by substantial evidence from multiple sources.
• Tip:  Stay updated with recent publications and incorporate the most current research to ensure relevance and accuracy.

Literature Review Matrix

A  Literature Review Matrix  is a powerful tool that helps you organize and evaluate the sources you've gathered for your literature review. Think of it as a structured table that allows you to visually track key details from each source, helping you compare and contrast research findings, methods, and relevance to your work.

The primary goal of a Literature Review Matrix is to provide a clear and organized view of your sources side-by-side. This makes it easier to spot patterns, identify gaps in the literature, and see how different studies connect or diverge. By using this matrix, you can:

• Summarize key information from each source.
• See the progression of research on a topic.
• Track how each source contributes to your own research goals.

When crafting your literature review, the matrix becomes a valuable reference. It offers a concise summary of each source, facilitating the synthesis of information and revealing connections between works. This organized approach helps ensure you cover all important themes and insights.

Key Components

A typical Literature Review Matrix includes:

• Author(s) & Date:  For tracking contributions and publication dates.
• Theoretical/Conceptual Framework:  Outlines the theories or concepts guiding the study.
• Research Question(s)/Hypotheses:  Identifies the focus and aims of the research.
• Methodology:  Describes the study design and methods used.
• Analysis & Results:  Summarizes the data analysis and key findings.
• Conclusions:  Highlights the main conclusions drawn from the research.
• Implications for Future Research:  Suggests areas for further investigation.
• Implications for Practice:  Discusses practical applications of the findings.

A Literature Review Matrix establishes a solid foundation for a well-organized literature review, ensuring you capture all critical insights and connections between sources. 

How to Use the Matrix

To make the most of your Literature Review Matrix, follow these steps to complete each category:

Author(s) & Date : Record the author(s) of the study and the publication date. This helps track contributions and the relevance of the research over time.

Theoretical/Conceptual Framework : Note the theories or concepts guiding the study. This provides insight into the foundation of the research and its theoretical background.

Research Question(s)/Hypotheses : Summarize the main research questions or hypotheses the study addresses. This clarifies the focus and objectives of the research.

Methodology : Describe the research design and methods used. This includes the type of study, data collection methods, and analysis techniques.

Analysis & Results : Outline the main findings and how the data was analyzed. This section highlights the key discoveries of the research.

Conclusions : Record the study’s conclusions and implications. This provides a summary of the research outcomes and their significance.

Implications for Future Research : Identify suggestions for further research proposed by the study. This helps in understanding how the research contributes to ongoing scholarly conversation.

Implications for Practice : Note any practical applications or recommendations made. This connects the research findings to real-world applications.

Accurately filling in each category of the Literature Review Matrix ensures a comprehensive and organized overview of your sources, making it easier to synthesize and integrate information into your literature review.

Why Use a Literature Review Matrix?

A Literature Review Matrix is not just a tool but a strategic aid in organizing and synthesizing your research. Here’s why it’s invaluable:

Enhanced Clarity : By laying out your sources in a matrix format, you gain a clear, visual representation of the key components of each study. This clarity helps in quickly identifying patterns, contradictions, and gaps in the literature.

Streamlined Synthesis : The matrix allows you to compare and contrast findings across multiple sources efficiently. This makes synthesizing information from different studies simpler, leading to a more cohesive and comprehensive literature review.

Efficient Writing : With all essential information organized in one place, writing your literature review becomes more straightforward. The matrix provides a structured reference that helps in drafting sections and ensuring that all relevant points are addressed.

Identification of Trends and Gaps : The matrix helps in spotting trends in research and identifying areas where further investigation is needed. This insight is crucial for framing your research questions and shaping your own study.

Improved Organization : It facilitates a systematic approach to managing your sources, reducing the risk of overlooking important details and ensuring that your review is well-organized and thorough.

Using a Literature Review Matrix enhances the efficiency and quality of your literature review process. It’s a powerful tool that supports clarity, synthesis, and effective writing, ultimately contributing to a more insightful and organized review.

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What is a literature review?

A literature review is an integrated analysis -- not just a summary-- of scholarly writings and other relevant evidence related directly to your research question.  That is, it represents a synthesis of the evidence that provides background information on your topic and shows a association between the evidence and your research question.

A literature review may be a stand alone work or the introduction to a larger research paper, depending on the assignment.  Rely heavily on the guidelines your instructor has given you.

Why is it important?

A literature review is important because it:

• Explains the background of research on a topic.
• Demonstrates why a topic is significant to a subject area.
• Discovers relationships between research studies/ideas.
• Identifies major themes, concepts, and researchers on a topic.
• Identifies critical gaps and points of disagreement.
• Discusses further research questions that logically come out of the previous studies.

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1. Choose a topic. Define your research question.

Your literature review should be guided by your central research question.  The literature represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

• Make sure your research question is not too broad or too narrow.  Is it manageable?
• Begin writing down terms that are related to your question. These will be useful for searches later.
• If you have the opportunity, discuss your topic with your professor and your class mates.

2. Decide on the scope of your review

How many studies do you need to look at? How comprehensive should it be? How many years should it cover? 

• This may depend on your assignment.  How many sources does the assignment require?

3. Select the databases you will use to conduct your searches.

Make a list of the databases you will search. 

Where to find databases:

• use the tabs on this guide
• Find other databases in the Nursing Information Resources web page
• More on the Medical Library web page
• ... and more on the Yale University Library web page

4. Conduct your searches to find the evidence. Keep track of your searches.

• Use the key words in your question, as well as synonyms for those words, as terms in your search. Use the database tutorials for help.
• Save the searches in the databases. This saves time when you want to redo, or modify, the searches. It is also helpful to use as a guide is the searches are not finding any useful results.
• Review the abstracts of research studies carefully. This will save you time.
• Use the bibliographies and references of research studies you find to locate others.
• Check with your professor, or a subject expert in the field, if you are missing any key works in the field.
• Ask your librarian for help at any time.
• Use a citation manager, such as EndNote as the repository for your citations. See the EndNote tutorials for help.

Review the literature

Some questions to help you analyze the research:

• What was the research question of the study you are reviewing? What were the authors trying to discover?
• Was the research funded by a source that could influence the findings?
• What were the research methodologies? Analyze its literature review, the samples and variables used, the results, and the conclusions.
• Does the research seem to be complete? Could it have been conducted more soundly? What further questions does it raise?
• If there are conflicting studies, why do you think that is?
• How are the authors viewed in the field? Has this study been cited? If so, how has it been analyzed?

Tips: 

• Review the abstracts carefully.  
• Keep careful notes so that you may track your thought processes during the research process.
• Create a matrix of the studies for easy analysis, and synthesis, across all of the studies.
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Common Assignments: Literature Reviews

Basics of literature reviews.

A literature review is a written approach to examining published information on a particular topic or field. Authors use this review of literature to create a foundation and justification for their research or to demonstrate knowledge on the current state of a field. This review can take the form of a course assignment or a section of a longer capstone project. Read on for more information about writing a strong literature review!

Students often misinterpret the term "literature review" to mean merely a collection of source summaries, similar to annotations or article abstracts. Although summarizing is an element of a literature review, the purpose is to create a comprehensive representation of your understanding of a topic or area of research, such as what has already been done or what has been found. Then, also using these sources, you can demonstrate the need for future research, specifically, your future research.

There is usually no required format or template for a literature review. However, there are some actions to keep in mind when constructing a literature review:

• Include an introduction and conclusion . Even if the literature review will be part of a longer document, introductory and concluding paragraphs can act as bookends to your material. Provide background information for your reader, such as including references to the pioneers in the field in the beginning and offering closure in the end by discussing the implications of future research to the field.
• Avoid direct quotations . Just like in an annotated bibliography, you will want to paraphrase all of the material you present in a literature review. This assignment is a chance for you to demonstrate your knowledge on a topic, and putting ideas into your own words will ensure that you are interpreting the found material for your reader. Paraphrasing will also ensure your review of literature is in your authorial voice.
• Organize by topic or theme rather than by author. When compiling multiple sources, a tendency can be to summarize each source and then compare and contrast the sources at the end. Instead, organize your source information by your identified themes and patterns. This organization helps demonstrate your synthesis of the material and inhibits you from creating a series of book reports.
•  Use headings . APA encourages the use of headings within longer pieces of text to display a shift in topic and create a visual break for the reader. Headings in a literature review can also help you as the writer organize your material by theme and note any layers, or subtopics, within the field.
• Show relationships and consider the flow of ideas. A literature review can be lengthy and dense, so you will want to make your text appealing to your reader. Transitions and comparison terms will allow you to demonstrate where authors agree or disagree on a topic and highlight your interpretation of the literature.

Related Multimedia, Social Media, and Other Resources

Randolph, J. J. (2009). A guide to writing the dissertation literature review. Practical Assessment, Research and Evaluation , 14 (13), 1–13. https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1219&context=pare

Didn't find what you need? Email us at [email protected] .

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What Is a Literature Review?

Review the literature, write the literature review, further reading, learning objectives, attribution.

This guide is designed to:

• Identify the sections and purpose of a literature review in academic writing
• Review practical strategies and organizational methods for preparing a literature review

A literature review is a summary and synthesis of scholarly research on a specific topic. It should answer questions such as:

• What research has been done on the topic?
• Who are the key researchers and experts in the field?
• What are the common theories and methodologies?
• Are there challenges, controversies, and contradictions?
• Are there gaps in the research that your approach addresses?

The process of reviewing existing research allows you to fine-tune your research question and contextualize your own work. Preparing a literature review is a cyclical process. You may find that the research question you begin with evolves as you learn more about the topic.

Once you have defined your research question , focus on learning what other scholars have written on the topic.

In order to  do a thorough search of the literature  on the topic, define the basic criteria:

• Databases and journals: Look at the  subject guide  related to your topic for recommended databases. Review the  tutorial on finding articles  for tips. 
• Books: Search BruKnow, the Library's catalog. Steps to searching ebooks are covered in the  Finding Ebooks tutorial .
• What time period should it cover? Is currency important?
• Do I know of primary and secondary sources that I can use as a way to find other information?
• What should I be aware of when looking at popular, trade, and scholarly resources ? 

One strategy is to review bibliographies for sources that relate to your interest. For more on this technique, look at the tutorial on finding articles when you have a citation .

Tip: Use a Synthesis Matrix

As you read sources, themes will emerge that will help you to organize the review. You can use a simple Synthesis Matrix to track your notes as you read. From this work, a concept map emerges that provides an overview of the literature and ways in which it connects. Working with Zotero to capture the citations, you build the structure for writing your literature review.

How do I know when I am done?

A key indicator for knowing when you are done is running into the same articles and materials. With no new information being uncovered, you are likely exhausting your current search and should modify search terms or search different catalogs or databases. It is also possible that you have reached a point when you can start writing the literature review.

Tip: Manage Your Citations

These citation management tools also create citations, footnotes, and bibliographies with just a few clicks:

Zotero Tutorial

Endnote Tutorial

Your literature review should be focused on the topic defined in your research question. It should be written in a logical, structured way and maintain an objective perspective and use a formal voice.

Review the Summary Table you created for themes and connecting ideas. Use the following guidelines to prepare an outline of the main points you want to make. 

• Synthesize previous research on the topic.
• Aim to include both summary and synthesis.
• Include literature that supports your research question as well as that which offers a different perspective.
• Avoid relying on one author or publication too heavily.
• Select an organizational structure, such as chronological, methodological, and thematic.

The three elements of a literature review are introduction, body, and conclusion.

Introduction

• Define the topic of the literature review, including any terminology.
• Introduce the central theme and organization of the literature review.
• Summarize the state of research on the topic.
• Frame the literature review with your research question.
• Focus on ways to have the body of literature tell its own story. Do not add your own interpretations at this point.
• Look for patterns and find ways to tie the pieces together.
• Summarize instead of quote.
• Weave the points together rather than list summaries of each source.
• Include the most important sources, not everything you have read.
• Summarize the review of the literature.
• Identify areas of further research on the topic.
• Connect the review with your research.
• DeCarlo, M. (2018). 4.1 What is a literature review? In Scientific Inquiry in Social Work. Open Social Work Education. https://scientificinquiryinsocialwork.pressbooks.com/chapter/4-1-what-is-a-literature-review/
• Literature Reviews (n.d.) https://writingcenter.unc.edu/tips-and-tools/literature-reviews/ Accessed Nov. 10, 2021

This guide was designed to: 

• Identify the sections and purpose of a literature review in academic writing 
• Review practical strategies and organizational methods for preparing a literature review​

Content on this page adapted from: 

Frederiksen, L. and Phelps, S. (2017).   Literature Reviews for Education and Nursing Graduate Students.  Licensed CC BY 4.0

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