WriteMyPapers.net How to Write an Annotated Bibliography: Summarise, Assess, Reflect (APA and MLA Examples)
In short
- An annotated bibliography is a list of sources, each followed by a short paragraph that summarises, assesses or reflects on it.
- Read the brief first: it decides which of the three moves you need and how long each annotation should be.
- Format the reference exactly as in a normal reference list, with a hanging indent, then indent the annotation below it.
- Write annotations as if you will reuse them, because the best ones become sentences in your literature review.
An annotated bibliography is often the first graded step of a research project: a proposal, a dissertation, a long essay. Students tend to treat it as admin; markers treat it as evidence of how you read. A good one shows that you understood each source, judged how far to trust it and know what it will do in your project. A weak one is a list of abstracts copied and lightly reworded, which is easy to spot and, depending on how it is done, close to plagiarism.
What it is
A bibliography is a list of the sources you used or plan to use. An annotation is a short paragraph of your own writing after each entry. The Purdue Online Writing Lab describes three things an annotation can do, alone or together:
- Summarise: what is the source about, what does it argue, and what topics does it cover?
- Assess: is it reliable and useful? Is it biased or objective? How does it compare with your other sources?
- Reflect: how does it fit your research? Will it shape your argument, supply evidence, or change how you see the question?
Purdue also notes that annotations can range from a couple of sentences to a couple of pages, depending on the purpose. That is why the first step is always the brief.
Step 1: decode the brief
Before you open a single source, find four answers in the assignment instructions:
- Which moves? "Descriptive" or "summary" annotations only need the first move. "Critical" or "evaluative" annotations need all three, with most of the words on assessment.
- How long? A word range per annotation, or a total word count divided by a required number of sources.
- How many sources, and what kind? Many briefs require a minimum number of peer-reviewed articles. Our guide to finding and evaluating scholarly sources covers where to look and how to check them.
- Which citation style? APA, MLA, Chicago or your department's house style. Order and format follow from it.
If the brief is silent on any of these, ask your tutor before you start.
Step 2: read for the annotation, not just the topic
Read each source with three questions written at the top of your notes: What does it claim? How do they know? What will I use it for? For a research article, the answers sit in predictable places: the research question at the end of the introduction, the method in its own section, the main findings at the start of the discussion and the limitations near the end. Note page numbers as you go so you can check later that your summary is accurate.
Do not draft from the abstract. An abstract is the authors' summary of their own work, written to sell it. Your annotation should be your summary, and it should include what the abstract leaves out, such as the sample size, the setting or a limitation the authors admit later in the paper. Our guide to paraphrasing without plagiarising explains how to restate an argument in your own words.
Step 3: write the annotation in three moves
A reliable pattern for a critical annotation is four to six sentences:
- One or two sentences on the source's aim and main finding or argument.
- One sentence on the method or evidence: who, what, how many, where.
- One or two sentences of assessment: strengths, limits, how it relates to other work on your list.
- One sentence of reflection: what the source will do in your project.
Write in full sentences and in the present tense for what the source says ("The authors argue…"), and the past tense for what the researchers did ("Students were asked…"). Avoid empty verdicts such as "This is a very useful source". Say why it is useful and for which part of your argument.
Format: APA 7 and MLA 9
The reference itself is formatted exactly as it would be in a normal reference list, with a hanging indent, so that only the first line sits at the left margin. The annotation starts on the next line as a separate indented block. According to Purdue's annotated bibliography samples, the annotation is indented 1 inch in MLA 9 and 0.5 inch in APA and Chicago. Entries are listed in alphabetical order of the first author's surname, unless your instructor asks you to group them by theme. For the rules of the reference entries themselves, see our APA, MLA and Chicago citation guide.
Example 1 (APA 7, critical annotation)
Roediger, H. L., III, & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255. https://doi.org/10.1111/j.1467-9280.2006.01693.x
Roediger and Karpicke test whether taking a test on material improves later memory more than studying it again. In two experiments, students read short prose passages and then either restudied them or took recall tests; retention was measured after delays ranging from five minutes to one week. Restudying gave a small advantage on the immediate test, but students who had been tested remembered more at the longer delays. The design is simple and the materials are realistic, although the participants were university students working with short passages in a laboratory, so the effect on whole courses and exam revision is an extrapolation. The study will anchor the section of my essay arguing that past papers and self-quizzing should replace rereading as the default revision method.
Example 2 (MLA 9, critical annotation)
Mueller, Pam A., and Daniel M. Oppenheimer. "The Pen Is Mightier Than the Keyboard: Advantages of Longhand Over Laptop Note Taking." Psychological Science, vol. 25, no. 6, 2014, pp. 1159–68, https://doi.org/10.1177/0956797614524581.
Across three experiments, Mueller and Oppenheimer compare students who took lecture notes on laptops with students who wrote by hand. Laptop users wrote more words and copied more of the lecture verbatim, and they did worse on conceptual questions; telling them not to transcribe did not stop the copying. The study is widely cited, but a 2019 replication by Morehead, Dunlosky and Rawson found no consistent difference in test scores between the two groups, so the headline claim should be presented as contested. I will use it for its better-supported finding, that verbatim transcription is a poor way to learn, and cite the replication alongside it.
Notice what both examples do. Each gives the method in a sentence, names a limitation in specific terms rather than "the sample was small", and ends with a concrete use. The second also shows how an assessment can draw on another source on your list. That is the beginning of synthesis.
From annotated bibliography to literature review
If the annotated bibliography is a step towards a larger project, write it so you can reuse it. Keep a column in your notes with a theme label for each source, such as "retrieval practice", "note-taking" or "limits of lab studies". When you start the review, group the annotations by theme instead of by author, and the paragraphs begin to write themselves. Our guide on how to write a literature review shows how to turn those groups into a synthesis matrix and then into prose.
Common mistakes
- Pasting or lightly rewording the abstract.
- Summaries with no assessment when the brief asks for critical annotations.
- Assessment that only says "reliable" or "useful", with no reason.
- Reference errors: missing DOI, wrong capitalisation of article titles for the style, italics in the wrong place.
- Listing sources you have not read beyond the title page. Markers notice when the annotation could have been written from the title.
A note on integrity
An annotated bibliography is a record of your own reading. Generating annotations with a paid service or an AI tool defeats its purpose and breaks most universities' rules, and AI-produced summaries of papers can include claims the paper never makes. Read the sources, write the annotations yourself, and check your institution's policy before using any tool.
Sources
- Purdue Online Writing Lab, Annotated Bibliographies and Annotated Bibliography Samples.
- Roediger, H. L., III, & Karpicke, J. D. (2006), and Mueller, P. A., & Oppenheimer, D. M. (2014), as cited above; Morehead, K., Dunlosky, J., & Rawson, K. A. (2019). How much mightier is the pen than the keyboard for note-taking? Educational Psychology Review, 31, 753–780.