The Merck index : an encyclopedia of chemicals and drugs.

MLA

Windholz, Martha. The Merck Index : an Encyclopedia of Chemicals and Drugs. 9th edition New Jersey: Merck, 1976.

APA

Windholz, M. (1976). The Merck index : an encyclopedia of chemicals and drugs. 9th edition New Jersey: Merck.

Chicago

Windholz, Martha, The Merck Index: An Encyclopedia of Chemicals and Drugs. 9th edition New Jersey: Merck, 1976.