Gaya APA

convention, T, U, S, P. (2007). The United States Pharmacopeia 31: The National Formulary 26 (26th. ed.). Rockville: The United States Pharmacopeial Convention, Inc.

Gaya MLA

convention, The, United, States, Pharmacopeial. "The United States Pharmacopeia 31: The National Formulary 26". 26th. ed. Rockville: The United States Pharmacopeial Convention, Inc, 2007. Text.