This page contains enriched content visible when JavaScript is enabled or by clicking here. 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.

University of Portland Clark Library

CHM 375/376: Organic Chemistry Lab: Writing & Help

American Chemical Society (ACS) Style

Common ACS Examples for UP Students

For detailed style guidelines see: Chapter Data & Datasets

For an online book or encyclopedia:

Cyclohexane. In CRC Handbook of Chemistry and Physics, 101st ed.; Rumble, J. R., Ed.; CRC Press, 2020. (accessed 2020-08-19). (CAS RN: 110-82-7).

For an online database:

Cyclohexane. The Merck Index Online. Royal Society of Chemistry, 2013. (accessed 2020-08-15). (CAS RN: 110-82-7).

Cyclohexane. SDBSWeb. National Institute of Advanced Industrial Science and Technology, n.d. (accessed 2020-08-17). (CAS RN: 110-82-7).

Cyclohexane. SciFinder. CAS, n.d. (accessed 2020-03-28). IR spectral data obtained from Bio-Rad Laboratories. (CAS RN: 110-82-7).

For detailed style guidelines see: Chapter Safety Data Sheets

Found through third-party provider:

Cyclohexane; CAS RN: 110-82-7; 650455; ver. 6; Sigma-Aldrich: St. Louis, MO, January 31, 2017. Retrieved from University of Portland MSDS Online. (accessed 2020-08-15).

Found on manufacturer site:

Cyclohexane; CAS RN: 110-82-7; 227048; ver. 6.4; Sigma-Aldrich: St. Louis, MO, January 23, 2020. (accessed 2020-08-15).

The Chemical Abstracts Service (CAS) Registry has 165 million organic and inorganic chemical substances. Each substance has been assigned a unique registry number (RN) that can be used to search for information in place of searching by substance name. This number can be referred to in a few ways:

CAS Registry Number
CAS Number

The number has dashes which are considered part of the number. For example, the CAS RN for Cyclohexane is: 110-82-7. Include the dashes when searching for information in various databases, and also when citing a source of information for a substance.

Other Writing Guides

UP Writing Center

For assistance with writing papers and citing sources, make an appointment with:


Teaching Librarian: Diane Sotak


Learning Commons | 503.943.7111 or 800.841.8261 | 5000 N. Willamette Blvd., Portland, OR 97203-5798
© 2020 University of Portland, All Rights Reserved | Icons made by Freepik from