Skip to Main Content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
ACS is the citation style of the American Chemistry Society. Below you will find examples of various sources cited in ACS format. Scroll down to find the type of source you need to cite. Contact a librarian if you need help!
What is a DOI Number?
A DOI number is a journal article's "digital object identifier." This is a unique number assigned to the article, which doesn't change, even if the URL does. It helps other researchers find the article later. Most new journal articles that you access online have a DOI number. Articles that you access in print will not have one, and many older articles also don't have one. The DOI number is often at the very bottom of the pages, near the page numbers. It may also be in the article's abstract page.
Basic Format for ACS Citations
ACS publications use one of three options for in-text citations:
- Author-Date: This option lists the author's last name and the date of publication in parentheses at the end of the sentence, before the period (Smith, 2019).
- Superscript numbers which appear after the sentence and punctuation. These correlate with matching numbered references in the reference list.3
- Italicized numbers, listed in parentheses before punctuation. These also correlate with matching numbers in the reference list (4).
Generally, your references should be listed according to the following format:
(Reference #) Author's Last Name, First Initial. Title of the Article. Title of the Journal or its Abbreviation. Year.
Issue #, pages.
Examples by Source Type
Journal Article Without a DOI Number:
Moles, E., Kavallaris, M. A Potent Targeted Cancer Nanotherapeutic. Nature Biomedical Engineering. 2019, 3, (4), 248.
Journal Article With a DOI Number:
Moles, E., Kavallaris, M. A Potent Targeted Cancer Nanotherapeutic. Nature Biomedical Engineering. 2019, 3, (4), 248. https://doi.org/10.1038/s41551-019-0390-7.
Full Print Book
Kenakin, T. A Pharmacology Primer: Techniques for More Effective and Strategic Drug Discovery, 4th edition.;
Academic Press: Amsterdam ; Boston, 2014.
Chang, K. Why a Perfect Spiral Football Pass Doesn’t Break the Laws of Physics. The New York Times. October 19, 2020.