The United States Pharmacopeial Convention. (2001). The United States Pharmacopeia: The National Formulary, USP:25 y NF:20 (Twentieth Edition.). (s.i.): The United States Pharmaopeial Convention.
Chicago Style CitationThe United States Pharmacopeial Convention. The United States Pharmacopeia: The National Formulary, USP:25 Y NF:20. Twentieth Edition. (s.i.): The United States Pharmaopeial Convention, 2001.
MLA CitationThe United States Pharmacopeial Convention. The United States Pharmacopeia: The National Formulary, USP:25 Y NF:20. Twentieth Edition. (s.i.): The United States Pharmaopeial Convention, 2001.
Warning: These citations may not always be 100% accurate.