Gaya APA

Amstrong, L, L. et al (2011). Drug Information Handbook : with International Trade Names Index, Book 2 (Ed. 20). United States of America: Lexicomp.

Gaya MLA

Amstrong, Lora, L.. et al. "Drug Information Handbook : with International Trade Names Index, Book 2". Ed. 20 United States of America: Lexicomp, 2011. Text.