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Usually yes, but it is a convention and an assignment choice rather than a law of the format. Library guides at Northwest Arkansas Community College and the Community College of Baltimore County both tell students to list annotated entries in alphabetical order by the lead author’s last name. Middlebury College’s guide adds that most are arranged alphabetically, but they can also be arranged chronologically or by topic. When your instructor, supervisor or committee gives different instructions, those instructions win.
The format
The short answer
Alphabetical order by the lead author’s surname is the default. The Community College of Baltimore County guide puts it this way: sources should be listed in alphabetical order by the last name of the lead author, according to the rules of the documentation style required by the assignment (it names MLA 9 and APA 7 as examples). The Northwest Arkansas guide says the same for APA: order the entries as you would order a reference list.
The exception is not a loophole. A date order (oldest to newest) or a topic order is a recognised alternative, and the same guides say so. What matters is that you choose one order, apply it consistently, and can explain the choice if asked.
What each style’s guidance says
The orderings below come from the library guides listed in Sources, not from the style manuals themselves.
| Style | What the library guides say about order | Where it comes from |
|---|---|---|
| APA | Format and order the entries in alphabetical order, the same as a reference list. | Northwest Arkansas Community College guide |
| MLA | Entries may be organised alphabetically by author or title (as in a normal list of works cited), by date of publication, or by subject. | Northwest Arkansas Community College guide |
| Chicago | The guides describe layout (a single-spaced citation, a double-spaced annotation aligned with the hanging indent) and give no separate ordering rule beyond the general alphabetical advice. | Northwest Arkansas Community College guide; Middlebury College guide |
| Any style, general advice | List alphabetically by lead author’s last name, following the rules of the required style; most lists are alphabetical but chronological or topical lists are possible. | Community College of Baltimore County guide; Middlebury College guide |
Treat this as the practical picture rather than a rule written in the manuals. Middlebury’s guide notes that most style manuals provide few details on how to write annotations, which is why local guidance and instructor instructions carry so much weight here. The Chicago row is a limit of those guides, not a statement about the Chicago manual.
When another order is acceptable
Chronological order
Useful when your argument is about how a field developed. The Middlebury guide lists it as an accepted arrangement. State the order in a one-line note at the top of the list so the reader does not assume an error.
Order by topic or theme
Useful for a long list that covers distinct strands, such as methods papers, empirical studies and policy documents. The Middlebury and Northwest Arkansas guides both accept subject grouping. A common practice (a practice suggested here, not a manual rule) is to keep each theme section alphabetical inside its heading, so the reader can still find a given author quickly.
When the instruction says nothing
Choose alphabetical. All three guides treat it as the default or most common choice, it matches the reference list you will probably write next, and it needs no explanation.
The manuscript and thesis angle
An annotated bibliography in a thesis proposal, a dissertation prospectus or a literature-review stage is read by a supervisor or committee, not a classroom instructor. The advice to follow your instructor’s guidelines carries over directly: ask the supervisor or check the programme handbook before choosing a thematic order. If you will later fold the sources into a literature review, an alphabetical list is easiest to reconcile with the final reference list, and a reference manager can export it in that order (see building an annotated bibliography in Zotero). The annotated list is a working document; the final reference list of the manuscript is a separate list of the works you actually cite, and it follows the target style’s own ordering rules.
How to alphabetize an annotated bibliography
- Format each citation in the required style first. In APA 7 reference entries, names are inverted (surname, then initials), so the surname is already the first element to sort on.
- Sort the finished entries by the first word of each entry, the lead author’s surname.
- Keep each annotation attached to its entry as its own paragraph directly below it, so the annotation moves with its citation when you re-sort.
- Title the list “Annotated Bibliography” (the Northwest Arkansas guide also gives “Annotated List of Works Cited” for MLA).
Examples
Illustration (fictitious sources, for layout only). These entries do not describe real publications:
Alvarez, M., & Chen, L. (2023). Reporting standards in example trials. Journal of Example Methods, 8(2), 15-31. https://doi.org/10.0000/example.001
Annotation paragraph follows here, beneath its own entry.Brandt, K. (2021). Writing the research proposal (2nd ed.). Example Press.
Annotation paragraph follows here, beneath its own entry.Okafor, T. (2019). Time budgets in doctoral work. Example Review of Graduate Study, 4(1), 3-19. https://doi.org/10.0000/example.002
Annotation paragraph follows here, beneath its own entry.
The pattern (inverted names, sentence-case article titles, italic periodical title and volume, DOI at the end) is the APA 7 reference pattern. The sort key is Alvarez, Brandt, Okafor. For indentation and annotation length in each style, see our annotated bibliography examples in APA, MLA and Chicago.
In-text citation version
An annotated bibliography is a stand-alone list, so its entries are not in-text citations. If you later cite one of these sources in a paper, the in-text form is built from the same author and year. For the fictitious first entry above, APA 7 uses (Alvarez & Chen, 2023) and MLA 9 uses (Alvarez and Chen) plus a page number when you quote or point to a passage. Chicago has two systems, notes-bibliography and author-date, so check which one your assignment requires. These in-text patterns are general style conventions, not statements taken from the library guides in Sources.
Common errors
- Sorting by title when there is an author. Where an author is named, the guides sort by the lead author’s last name. The Northwest Arkansas guide mentions author-or-title ordering only for MLA, “as for a normal list of works cited”.
- Mixing two orders without saying so. A list that is alphabetical for half the entries and chronological for the rest reads as a mistake.
- Re-sorting citations but not annotations. Annotations belong directly beneath their entry; sort the pair together.
- Ignoring the instruction sheet. The Northwest Arkansas guide says to always follow your instructor’s guidelines.
- Importing indentation from the wrong style. The Northwest Arkansas guide describes an APA annotation indented 0.5 inch from the left margin and an MLA annotation indented one inch from the start of the entry; do not mix them. See the MLA works cited format and Chicago works cited guides for the matching list layouts.
Style-guide edition
As of October 2026 the editions this page refers to are APA 7th edition (2020), MLA 9th edition (2021) and Chicago 18th edition (2024). If your instructor or journal names a different edition, follow that one.
FAQ
Does an annotated bibliography have to be in alphabetical order?
Not always, but it is the default. APA-based guidance says to order entries as in a reference list, which is alphabetical. Chronological and topical orders are accepted where the assignment allows them.
What do I alphabetize by?
The lead author’s last name, which is the first word of a citation in the author-first styles.
Can I group sources by theme?
Yes, where the instructor or supervisor allows it. Keep each group’s entries alphabetical, and give each group a clear heading.
Is the annotated bibliography the same as the reference list?
No. The annotated list evaluates sources; the reference list of a finished paper lists the works actually cited. For the broader list concept, see the bibliography entry in the dictionary, and for how an annotated list feeds into a review, see how to write a literature review.
Sources
- Northwest Arkansas Community College Library, “Annotated Bibliography: Formatting”, https://libguides.nwacc.edu/abib/formatting. Last updated 18 Nov 2025; checked 29 Oct 2026.
- Community College of Baltimore County Library, “Citations: Annotated Bibliography”, https://libraryguides.ccbcmd.edu/Citations/annotatedbib. Last updated 16 Sep 2026; checked 29 Oct 2026.
- Middlebury College Library, “Citation Guide: Annotated Bibliographies”, https://middlebury.libguides.com/citation/annotated. Last updated 31 Aug 2026; checked 29 Oct 2026.
- APA reference pattern: Publication Manual of the APA, 7th edition (2020), https://apastyle.apa.org/instructional-aids/reference-guide.pdf.
- Chicago edition: Chicago Manual of Style, 18th edition (2024), https://www.chicagomanualofstyle.org/help-tools/what-s-new.html. MLA edition: MLA Handbook, 9th edition (2021).
