Annotated Bibliography Example: A Full Worked Sample (APA & MLA)

An annotated bibliography entry has two parts: a correctly formatted citation, and a short paragraph — the annotation — that summarizes, evaluates, and (usually) explains the source’s relevance to a specific project. Most students and early-career researchers can produce the citation half without difficulty. The annotation half is where guidance runs thin, because seeing the correct format of an annotated bibliography doesn’t show you how to actually write one. This guide does that: a full worked example, sentence by sentence, in both APA and MLA, plus the structure and mistakes that apply regardless of citation style.

For the underlying concept — what a bibliography is and how it differs from a reference list or works-cited page — see CASRAI’s dictionary entry on the bibliography. This page assumes you already know that and goes straight to the annotation itself.

What makes an entry “annotated”

A plain bibliography lists sources. An annotated bibliography lists sources and, under each one, a paragraph (typically 100–200 words, though instructors and journals vary) that does some combination of three jobs:

• Summarize — what the source actually argues, reports, or covers, in your own words, not the abstract copied verbatim.
• Evaluate — the source’s method, scope, authority, or limitations. Is it a large-sample survey or a single case study? Peer-reviewed or a working paper? Current or superseded by later work?
• Reflect — how the source fits your own project: what it supports, what it contradicts, or what gap in it your work addresses.

An annotation that only summarizes is called descriptive; one that summarizes and evaluates is critical or evaluative; one that also states relevance to a specific paper or thesis is sometimes called combined or analytical. Assignment instructions and journal/funder submission guidelines usually specify which is wanted — check before you write, since a purely descriptive annotation submitted where an evaluative one was expected is a common reason these get sent back for revision.

Worked example: APA style

The entry below is an illustrative composite, built specifically to demonstrate structure and annotation craft — it is not a citation to a real, retrievable publication, and the author names and journal title are placeholders. Using a source you can’t actually verify and retrieve is one of the most common annotated-bibliography mistakes (see the mistakes section below); every entry in a real bibliography must point to something a reader could actually go find.

Notice what each sentence in that annotation is doing:

1. Sentence 1 (summarize): states the method (survey), the population, and the specific finding — not a restatement of the title.
2. Sentence 2 (evaluate): names a concrete limitation (sample size, disciplinary scope) and credits the authors for disclosing it themselves, rather than a vague “this study has limitations.”
3. Sentence 3 (reflect): states specifically how this source shaped the writer’s own project — not “this source is relevant to my topic,” which says nothing a reader can use.

Citation mechanics: APA (7th edition, American Psychological Association, 2020) uses the author-date system, with the annotation as an indented paragraph directly beneath the reference-list-formatted citation. For the underlying reference-list and in-text rules this entry follows, see CASRAI’s guide to literature review writing, which covers source synthesis at the whole-paper scale rather than the single-entry scale this page focuses on.

Worked example: MLA style

Same composite-disclosure note applies: the entry below is illustrative, not a real retrievable source.

MLA (9th edition, Modern Language Association, 2021) formats the citation itself differently from APA — author name inverted, title italicized, publisher and year without parentheses — but the annotation paragraph does the same three jobs regardless of citation style. Style choice is a formatting decision; annotation craft is a separate skill that transfers across styles.

A note on Chicago-style annotated bibliographies

Chicago (18th edition, University of Chicago Press, 2024) has two separate citation systems — notes-bibliography (footnotes/endnotes with a closing bibliography) and author-date — and an annotated bibliography built on either one follows the same annotation content described above; only the citation line itself changes format. Which system applies is usually set by field or publisher convention, not writer preference, so confirm which one is expected before formatting entries.

Step-by-step: writing your own annotation

1. Read the whole source, not just the abstract or introduction — a summary built from the abstract alone routinely misses the actual method or a key limitation, and it shows.
2. Draft the citation first, in the exact style your assignment, journal, or funder requires, and confirm every element (author order, date, italics, punctuation) against a current style manual rather than a remembered format.
3. Write the summary sentence(s) in your own words: method or approach, scope, and the specific finding or argument — specific enough that a reader who hasn’t seen the source understands what it actually did.
4. Write the evaluation sentence(s) if your assignment calls for a critical/evaluative annotation: authority of the source (peer-reviewed? preprint? industry report?), scope and sample, and any limitation the source itself acknowledges or that’s evident from its design.
5. Write the relevance sentence if a combined/analytical annotation is expected: state specifically what this source supports, contradicts, or leaves open in your own project — not a generic relevance claim.
6. Check length and consistency across every entry — most assignments expect roughly comparable annotation lengths (commonly 100–200 words) unless a source genuinely warrants more or less discussion.

Common mistakes

• Restating the title or abstract instead of summarizing the actual content — a giveaway that the source wasn’t fully read.
• Citing a source that can’t actually be retrieved — a broken link, a paywalled page never actually accessed, or (increasingly) a source that doesn’t exist at all because it was generated rather than found. Every entry must point to something a reader could go verify.
• Mixing annotation types within one bibliography without the assignment calling for it — some entries purely descriptive, others evaluative, with no consistent logic.
• Uneven annotation length with no justification — one entry at 40 words, another at 300, for sources of comparable importance to the project.
• Treating the annotated bibliography as a substitute for a literature review’s argument — an annotated bibliography is source-by-source; a literature review synthesizes across sources into a single argument. See CASRAI’s literature review guide for that distinction in full.

Frequently asked questions

How long should each annotation be?

Commonly 100–200 words per entry, but this varies by assignment, journal, or funder instructions — some ask for a single sentence per source (a “descriptive note”), others for a full evaluative paragraph. Follow the specific instructions you were given rather than a generic rule; when none are given, 100–150 words per source is a reasonable default for a critical annotation.

Is an annotated bibliography the same as a literature review?

No. An annotated bibliography addresses sources one at a time, each with its own self-contained paragraph. A literature review synthesizes multiple sources into a single connected argument about what the existing body of work shows and where the gap is. An annotated bibliography is sometimes assigned as a preparatory step toward writing a literature review, but the two are not interchangeable, and a paragraph that just describes one source at a time is not doing the synthesis work a literature review requires.

Does every entry need to be in the same citation style?

Yes, within a single bibliography — consistency of citation style (APA throughout, or MLA throughout, or Chicago throughout) is expected unless an assignment explicitly asks you to demonstrate multiple styles, which is unusual outside of a style-instruction exercise like this one.

Can I use AI-generated text to write my annotations?

Treat this as a source-verification issue before a policy issue: an annotation must accurately describe a source you have actually read, and a generated summary can misstate a source’s method or findings, or in the worst case cite a source that doesn’t exist. Whatever tools you use, verify the citation resolves to a real, retrievable source and that the annotation content is accurate to what that source actually says before submitting it — and check your specific institution’s or journal’s policy on generative-AI use in written work, which varies and is not addressed by citation-style rules.

Related CASRAI resources

• Bibliography (dictionary entry) — the underlying concept and how it differs from a reference list.
• How to Write a Literature Review — synthesizing multiple sources into a single argument.
• How to Write a Paper Proposal — another worked, annotated example in the same format-plus-walkthrough style.
• Poster Abstract Example — a worked, annotated sample for a different manuscript-structure task.