An annotated bibliography is a list of citations in which each entry is followed by a brief paragraph — the annotation — that describes, evaluates and situates the source. Unlike a plain reference list, it tells the reader not just what you cited but why it matters. A good annotation usually does three jobs: summary (what the source argues), evaluation (how credible or useful it is) and relevance (how it relates to your project).
What an annotation contains
Each annotation is typically 100–200 words and follows immediately after a full, correctly formatted citation. Depending on the assignment, annotations may be descriptive (summary only), evaluative (summary plus a judgement of quality), or reflective (how the source informs your own argument). Many tutors ask for all three elements. The citation itself follows whatever style you are using; for the underlying principles, see our explainer on what a citation is.
How to write an annotated bibliography
Follow these steps in order.
- Define your scope. Decide the topic and the criteria a source must meet to be included — recency, methodology, authority, relevance to your research question.
- Find and select sources. Search databases and library catalogues, then choose the works that genuinely advance your argument rather than everything you find.
- Record full citations. Capture complete, accurate references in your chosen style as you go. A reference manager makes this much faster.
- Read critically. Note the thesis, method, evidence and limitations of each source.
- Write the annotation. In a short paragraph, summarise the source, evaluate its strengths and weaknesses, and explain its relevance to your work.
- Order the entries. Arrange alphabetically by author (most common), or chronologically or thematically if that suits the project.
- Proofread and check. Verify every citation against the source — generated references in particular need checking, as we explain in our guide to citation accuracy.
Annotation styles compared
| Type | Contains | Best for |
|---|---|---|
| Descriptive | Summary only | Surveying a field |
| Evaluative | Summary + critique | Assessing source quality |
| Reflective | Summary + relevance to your project | Planning a dissertation or literature review |
A worked example
The following illustrates an evaluative annotation. The citation comes first, then the paragraph.
Smith, J. (2023). Open data practices in clinical research. Journal of Research Standards, 12(2), 45–61. https://doi.org/10.xxxx/example
Smith surveys data-sharing policies across forty clinical journals and argues that mandatory deposit improves reproducibility. The study’s strength is its breadth; its limitation is a focus on policy text rather than compliance in practice. The article is directly relevant to my project because it frames the gap between stated and enacted open-data norms that my dissertation investigates.
Note how the example uses a DOI rather than a plain URL for durability. For the difference between an annotated bibliography and other list types, see our overview of bibliographies and how to compile them, and our hub on research outputs.
Common pitfalls
Avoid simply abstracting the source without evaluating it, padding annotations to a word count, or copying the publisher’s blurb. Keep your own analytical voice, and make sure every citation is verified against the original — accurate referencing supports the integrity of the wider scholarly record discussed across our dictionary.
Frequently asked questions
How long should each annotation be?
Most annotations run to one short paragraph of roughly 100–200 words. Always follow your assignment brief, which may specify a length or which elements (summary, evaluation, relevance) are required.
What is the difference between an annotated bibliography and an abstract?
An abstract is a neutral, author-written summary of a single work. An annotation is written by you and adds evaluation and a statement of relevance to your own project, so it is critical rather than purely descriptive.
Do annotations need full citations?
Yes. Each entry begins with a complete, correctly formatted citation in your chosen style, then the annotation follows. The citation must be accurate and verified, just as in a standard reference list.
Can I use a reference manager to build one?
Yes. Tools such as Zotero, Mendeley and EndNote store your sources and generate formatted citations; you then write the annotations beneath each entry. Always check the generated citation against the source.
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