Gaya APA

convention, T, U, S, P. (2001). The United States Pharmacopeia 25: The National Formulary 20, vol. 1 (20th. ed.). Rockville: The United States Pharmacopeial Convention, Inc.

Gaya MLA

convention, The, United, States, Pharmacopeial. "The United States Pharmacopeia 25: The National Formulary 20, vol. 1". 20th. ed. Rockville: The United States Pharmacopeial Convention, Inc, 2001. Text.