Gaya APA

Budavari, S. (1989). The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (11th ed). New York: Merck \r Co.

Gaya MLA

Budavari, Susan. "The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals". 11th ed New York: Merck \r Co, 1989. print.