How to Write a Literature Review: A Practical Guide

What is a literature review?

A literature review is a critical synthesis of existing research on a topic. It is not a summary of sources listed one by one, it is an analytical discussion that identifies themes, debates, gaps, and contradictions across the literature, positioning your own research within the scholarly conversation.

Literature reviews appear as standalone assignments at undergraduate level and as dedicated chapters within dissertations and theses at postgraduate level. The expectations at each level differ, but the core requirement, critical engagement with sources rather than description, remains constant. If you need professional support, GradeQuill's literature review writing service is available at all academic levels.

Search for relevant sources

Begin with academic databases: Google Scholar, JSTOR, PubMed (for health sciences), PsycINFO (for psychology), and your institution's library portal. Use Boolean operators (AND, OR, NOT) to refine searches and combine keywords effectively.

Prioritise peer-reviewed journal articles and academic books. Government reports, official statistics, and policy documents may also be relevant depending on your subject. Check that sources are sufficiently recent, most supervisors expect the majority of sources to be published within the last ten years, unless you are discussing foundational theoretical work.

Evaluate your sources critically

Not all sources carry equal weight. When evaluating a source, consider: the credibility of the author and publication, the methodology used, the sample size and context, the date of publication, and whether the findings have been replicated or challenged by subsequent research.

Strong literature reviews do not simply accept what sources say, they question methodology, note limitations, and identify where scholars disagree. This critical evaluation is what distinguishes a postgraduate literature review from an undergraduate one. For further guidance on critical thinking in writing, see our article on what is critical analysis.

Organise by theme, not by author

One of the most common mistakes in literature reviews is presenting sources one by one, a paragraph on Smith, a paragraph on Jones, a paragraph on Williams. This produces a summary rather than a synthesis.

Organise your review thematically: identify two to five major themes or debates within the literature, and discuss each theme by drawing on multiple sources. This approach demonstrates that you understand how sources relate to one another, which is the hallmark of a well-synthesised review.

Write critically, not descriptively

Critical writing means doing something with your sources, comparing them, contrasting them, identifying where they agree or contradict, and evaluating their relative strengths. Descriptive writing merely reports what each source says.

Use language that signals analytical engagement: "whilst Smith (2020) argues that…, Jones (2021) contends that…", "this position is complicated by…", "a key limitation of this study is…", "these findings are consistent with…". This kind of language shows your examiner that you are evaluating the literature, not just presenting it.

Structure your literature review

A well-structured literature review has a clear beginning, middle, and end. The introduction defines the scope of the review and explains how sources were selected. The body is organised thematically. The conclusion summarises the key debates identified, highlights the gap your research addresses, and leads logically into your methodology chapter.

For a detailed guide to dissertation structure overall, read our article on how to write a dissertation.

Reference correctly

Every source cited in your literature review must be correctly referenced both in the text and in your reference list. Inconsistent or incomplete referencing loses marks and undermines the credibility of your work.

The most commonly required styles in UK universities are Harvard, APA 7th Edition, and OSCOLA (for law). For complete referencing guides, see our articles on Harvard referencing and APA 7th referencing. If you need your references formatted professionally, GradeQuill's referencing and formatting service covers all major styles.