Gaya APA

J, O. (2006). The Merck Index : An Encyclopedia of Chemicals,Drugs, and Biologicals (14 th ed). USA: Merck \r Co.

Gaya MLA

J, Oneil,Maryadele. "The Merck Index : An Encyclopedia of Chemicals,Drugs, and Biologicals". 14 th ed USA: Merck \r Co, 2006. print.