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Albert S. Cook Library

ACS Style

Learn to cite sources using American Chemical Society (ACS) Style.

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In this guide

Examples on this page are based on the 3rd edition of the ACS Style Guide: Effective Communication of Scientific Information (2006). Remember, your professor is the final authority for the bibliographic form, including spacing used in your paper.

ACS Style Guide

In-text Citations

There are three ways to cite references in-text using ACS Style. Select ONE in-text style to use consistently throughout your paper.

Superscript numbers - References are listed at the end of the paper in the order they appear in the paper. If a reference is used more than once, it keeps the same superscript number throughout your paper.

Example: Smith et al. discovered similar results1

Italicized numbers in parentheses - References are listed at the end of the paper in the order they appear in the paper. If a reference is used more than once, it keeps the same number throughout your paper.

Example: Weber and Mathews reported related findings (9). Another recent study (10) indicates that...

Author and date in parentheses - References are listed at the end of the paper in alphabetical order by the author's last name.

Example: ... the binding behavior of BaP-linker haptens (Chen and Pellequer, 2004). Smith (1998) draws similar conclusions.