Gaya APA

convention, T, U, S, P. (2005). The United States Pharmacopeia 28: The National Formulary 23 (23th. ed). Rockville: The United States Pharmacopeial Convention, Inc.

Gaya MLA

convention, The, United, States, Pharmacopeial. "The United States Pharmacopeia 28: The National Formulary 23". 23th. ed Rockville: The United States Pharmacopeial Convention, Inc, 2005. Text.