The formatting rules you need before you start
An annotated bibliography in APA format is a reference list where each citation is followed immediately by a short paragraph that summarizes, evaluates, or reflects on the source. The citation itself follows APA 7th edition rules exactly as it would in any reference list: hanging indent, double spacing, alphabetical order by first author’s last name.
The annotation sits directly below the citation, indented to match the hanging indent’s body text (half an inch from the left margin), and it is also double spaced. No blank line separates the citation from the annotation. No blank line separates one full entry from the next, either, just the continuation of double spacing throughout. If your word processor’s default paragraph spacing is adding gaps, turn it off.
The page itself carries the heading “Annotated Bibliography” centered and in bold at the top, the same way “References” heads a standard APA reference list.
A complete entry, written out
Here is a journal article entry formatted correctly from citation through annotation.
Author, A. A., & Author, B. B. (2021). Sleep deprivation and academic performance in undergraduate students: A longitudinal analysis. Name of the Journal, 113(4), 812-829. https://doi.org/10.0000/0000000
This study tracked 340 first-year undergraduates across two semesters, measuring sleep duration against GPA outcomes at six-week intervals. The authors used self-reported sleep logs alongside administrative grade data, which introduces some measurement error, though the longitudinal design strengthens the causal argument. The findings suggest that students sleeping fewer than six hours on weekday nights showed a statistically meaningful GPA decline by week twelve. This source is directly relevant to the argument that institutional scheduling contributes to student underperformance, and it will support the policy section of the project.
A first attempt at the same entry usually reads something like this.
Author and Author (2021) wrote about sleep and grades. They found that less sleep means worse grades. This is useful for my paper.
The trouble is not the writing style, though that needs work. The trouble is that the annotation tells the reader nothing they could not have guessed from the title. There is no method, no sample, no qualification of reliability, and no specific link to the project. An instructor reading the second version has no evidence that you read the source carefully or thought about why it belongs here. The first version, by contrast, names the sample size, flags a methodological limitation, identifies the finding precisely, and explains the connection to the actual argument. That is the standard to meet.
What changes depending on your assignment
The core rules above hold across disciplines, but several variables shift the details.
Level matters first. A 100-level assignment might accept 75 words of summary per source. A graduate seminar or a capstone project will typically require 150 to 200 words of genuine evaluation per entry, including comment on the author’s methodology and the source’s position within the broader conversation of the field. If your brief specifies a word count, that count overrides any general guideline.
Discipline shapes tone. A psychology annotation tends to focus on sample size, research design, and statistical findings. A literature annotation might spend more time on theoretical framework or critical perspective. A nursing or social work annotation will often be asked to address how findings translate to practice. The APA citation format stays the same; what the annotation prioritizes changes.
Some departments use an older APA edition. APA 7th edition (published 2020) dropped the publisher location from book citations, removed “Retrieved from” before most URLs, and changed the way running heads work. If your syllabus says APA 6th edition, the annotation rules are identical but the citation format differs in those specific places. When in doubt, ask your instructor which edition they want rather than assuming.
The number of sources also changes how you approach the work. A five-source annotated bibliography is usually a standalone assignment where each entry gets careful individual treatment. A twenty-source bibliography attached to a research proposal might tolerate slightly shorter annotations because the volume itself demonstrates coverage. Read the rubric, not just the format guide.
For a broader look at how to build the bibliography from the beginning, choosing sources, reading them, and structuring the write-up, the post How to Write an Annotated Bibliography, From Scratch covers that ground.
The mistakes that show up most often
Formatting errors cluster around a few specific points. Here is what to check in your own draft before you submit.
The hanging indent is missing or applied to the whole entry. A hanging indent means the first line of the citation starts at the left margin and every subsequent line of that citation is indented half an inch. The annotation then begins on the line immediately below and is indented throughout. It does not use a hanging indent of its own. If your whole page is indented, or if nothing is indented, the formatting is wrong.
The annotation summarizes without evaluating. “This article discusses X” is not an annotation; it is a sentence that could have been lifted from the abstract. You need to say something about how the source reaches its conclusions, what its limitations are, and why it belongs in your bibliography. Those three moves - method, limitation, and relevance - cover most of what a grader looks for, and an annotation that skips any one of them tends to lose marks even when the citation itself is formatted perfectly.
The citation format is inconsistent within the same document. Students often mix APA and MLA habits, particularly around author names (APA uses initials for first names, not full names), italics (the journal name and volume number are italicized in APA, but not the issue number), and the DOI (always include it when available, formatted as a hyperlink or plain URL beginning with https://doi.org/).
Italics are applied to the wrong element. In a journal article citation, the journal title and the volume number are italicized together as a unit: Journal of Educational Psychology, 113(4). The article title itself is not italicized and not in quotation marks. In a book citation, the book title is italicized. These two cases trip up most students at least once.
The annotation is pasted in as a block without indentation, or it is separated from the citation by a blank line. Neither matches APA format. The annotation is part of the entry; treat it as such visually.
There is also a subtler problem worth flagging. Students sometimes write every annotation in the same pattern, sentence for sentence, as if working from a fixed template. Graders notice the repetition, and it signals that the annotations were produced mechanically rather than by actually engaging with each source. Vary the order in which you cover method, finding, and relevance depending on what is most significant about that particular source. The format is fixed; the content should respond to what you actually read.
What to do with your draft now
Go through each entry and check three things: the citation matches APA 7th edition mechanics, the annotation names a method or approach, and the annotation explains specifically why this source matters to your project. If any entry fails one of those checks, that is where to spend the next pass.
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Frequently asked questions
How long should an annotation be in APA format?
Most instructors expect 100 to 200 words per annotation, though some assignments specify a word count directly. If no count is given, aim for a paragraph that covers the source's argument, its method or approach, and its relevance to your project. A single sentence is never enough; a full page is almost always too much.
Does an annotated bibliography have a title page in APA?
Yes, if your instructor requires APA 7th edition format throughout. The title page follows the same rules as any APA paper: title centered in bold on the upper half of the page, then your name, institution, course, instructor, and date on separate lines below. Some instructors waive the title page for standalone bibliography assignments, so check the brief.
Is an annotated bibliography double spaced in APA?
The citation line itself is double spaced and uses a hanging indent, exactly as a standard APA reference list entry would be. The annotation follows directly below the citation with no blank line between them, and it too is double spaced. There is no extra blank line between the annotation and the next entry.
Do I alphabetize an annotated bibliography in APA?
Yes. Entries are ordered alphabetically by the first author's last name, exactly as they would be in a standard APA reference list. If you have two works by the same author, order them by publication year, earliest first.
What is the difference between a descriptive and an evaluative annotation?
A descriptive annotation summarizes what the source says without judging it. An evaluative annotation goes further and assesses the source's reliability, methodology, or usefulness for your research. Many APA annotated bibliography assignments want the evaluative kind, so confirm with your instructor before you write a dozen summaries when analysis was expected.
Can I use first person in an APA annotation?
APA 7th edition does permit first person, and using it in an evaluative annotation is often clearer than writing in the passive voice. Phrases like 'I will use this source to...' or 'This study supports my argument by...' are acceptable. That said, some instructors prefer third person throughout, so check your assignment guidelines.