APA (7th ed.) Citation

Patterson, A. M., & Capell, L. T. (1940). The ring index: A list of ring systems used in organic chemistry. Reinhold.

Chicago Style (17th ed.) Citation

Patterson, Austin M., and Leonard T. Capell. The Ring Index: A List of Ring Systems Used in Organic Chemistry. New York: Reinhold, 1940.

MLA (9th ed.) Citation

Patterson, Austin M., and Leonard T. Capell. The Ring Index: A List of Ring Systems Used in Organic Chemistry. Reinhold, 1940.