Do not alphabetize a numerical list
When your instructions use citation-order numbering, keep entries in order of first mention. Alphabetizing them breaks the link between text numbers and references.
Reference list workbench
ACS Bibliography Generator
Create references one source at a time and collect them in a numbered ACS bibliography. Mix journal articles, books, and websites, preserve citation order, then copy the list or download it as a text file.
Free to useNumbered automaticallyCopy or download
Start generatingBibliography builder
Build your ACS bibliography
Choose a source type, complete its fields, and add the finished reference to the list. Repeat for every source in the order it first appears in your writing.
Source type Required fields
Numbered references
How an ACS bibliography fits your paper
In the common numerical ACS system, a number in the text points to the matching full reference at the end of the document. The first new source cited becomes reference 1, the next new source becomes reference 2, and so on. The bibliography generator follows that practical workflow: each completed entry is appended to a numbered list in the order you add it. It does not alphabetize the references or silently rearrange them.
The full entry still follows the pattern for its source type. A journal article needs authors, title, journal, year, volume, pages or article number, and a DOI when available. A whole book uses authors, title, edition when applicable, publisher, year, and optional DOI. A website uses a responsible author or organization, page title, direct URL, and other visible publication details when available. One reference list can contain all three without forcing them into one generic template.
People often use “bibliography” and “reference list” interchangeably, but your instructor or target journal may distinguish them. A reference list normally contains the works actually cited, while a broader bibliography can include works consulted but not cited. This tool builds a numbered list from the entries you deliberately add. You remain responsible for matching each number to the correct place in the text and for applying any journal-specific layout rules in your final document.
List anatomy
A clean ACS bibliography, step by step
Consistency belongs inside every entry, while numbering belongs across the list. Review both levels before moving the bibliography into your paper.
ACS / PATTERN
1. First source cited → 2. Next new source → 3. Next new source
- 01
Reference number
1.The number connects the in-text citation with the full entry. The tool assigns numbers from the order in which references are added.
- 02
Source-specific entry
Authors. Title. Publication details.Each entry keeps the field order and punctuation for its own source type rather than using a single generic bibliography pattern.
- 03
Citation order
first mention → reference 1Add sources in the order they first appear in your document. Reusing a source normally points back to its existing number instead of creating a duplicate entry.
- 04
Consistent metadata
DOI: 10.1021/...Check author order, titles, dates, identifiers, and source type. Consistent punctuation cannot repair incorrect or incomplete metadata.
- 05
Final document styling
journal or course templateAfter copying the list, apply the font, spacing, indentation, and in-text number treatment required by your final submission format.
Mixed-source example
Example numbered ACS bibliography
1. Tan, G. Y.; Das, M.; Keum, H.; Bellotti, P.; Daniliuc, C.; Glorius, F. Photochemical single-step synthesis of β-amino acid derivatives from alkenes and (hetero)arenes. Nat. Chem. 2022, 14 (10), 1174−1184. DOI: 10.1038/s41557-022-01008-w 2. Atkins, P. Concepts in Physical Chemistry, 2nd ed.; Royal Society of Chemistry, 2024. DOI: 10.1039/9781837674244 3. American Chemical Society. ACS Publications Home Page. https://pubs.acs.org/
Four actions
How to build an ACS bibliography
- 01
Follow your document
Start with the first outside source mentioned in your writing. Select journal article, book, or website to open the correct metadata fields.
- 02
Generate one reference
Enter and verify the source details, then read the live preview. Fix metadata errors before adding the entry to the list.
- 03
Add sources in order
Choose “Add to bibliography” and repeat for each next new source. Remove an entry and rebuild the order if the document sequence changes.
- 04
Copy, download, and check
Copy the formatted list or download the text file, then compare every number with the citations in your paper and the final submission rules.
List accuracy
Checks before you submit the bibliography
A numbered list can look finished while still containing sequence or metadata errors. Review the relationship between the document and the reference list, not just the punctuation.
Review the current ACS Style Quick GuideReuse the existing number
When the same source appears again, point back to its original number unless your journal specifies a different system. Avoid adding a duplicate reference by accident.
Match every number both ways
Every in-text number should resolve to one list entry, and every list entry should be cited where appropriate. Orphaned numbers and unused entries deserve review.
Apply local presentation rules
ACS publications and academic departments can specify different in-text treatments, spacing, or other layout details. Their instructions are the final authority.
Bibliography FAQ
Common ACS bibliography questions
01Is an ACS bibliography numbered or alphabetical?
A common ACS system numbers references in the order they are first cited, so the list is not alphabetical. ACS also recognizes variations, including author–date treatment, so follow the system required by your course or target journal.
02What is the difference between an ACS citation and bibliography entry?
The in-text citation points to a source, often with a number. The bibliography or reference-list entry supplies the full author, title, publication, date, and identifier information needed to find that source.
03Can one ACS bibliography include articles, books, and websites?
Yes. Each entry follows its own source-specific pattern, while all entries share one numbering sequence. Choose the correct form for each source before adding it to the list.
04Does the generator insert citations into my paper?
No. It formats and collects the reference entries in your browser. You must place the in-text numbers, reuse existing numbers for repeated sources, and keep the list synchronized with your document.
05What happens if I add references in the wrong order?
The tool preserves the order you add them. Remove entries or clear and rebuild the list so its numbering matches the order of first citation in your writing.
06Can I save or export the ACS bibliography?
You can copy the whole numbered list or download it as a plain-text file. After pasting it into your document, apply any required indentation, spacing, font, and journal-specific layout.