Gaya APA

convention, T, U, S, P. (1994). The United States Pharmacopeia 23: The National Formulary 18 (18th. ed.). Rockville: The United States Pharmacopeial Convention, Inc.

Gaya MLA

convention, The, United, States, Pharmacopeial. "The United States Pharmacopeia 23: The National Formulary 18". 18th. ed. Rockville: The United States Pharmacopeial Convention, Inc, 1994. Text.