Gaya APA

(NF), T, U, S, P, (, N, F. (1995). USP 23 NF 18 = The United States Pharmacopeia (USP) National Formulary (NF) . Washington: United states pharmacopeial covention.

Gaya MLA

(NF), The, United, States, Pharmacopeia, (USP), National, Formulary. "USP 23 NF 18 = The United States Pharmacopeia (USP) National Formulary (NF)". Washington: United states pharmacopeial covention, 1995. Text.