APA Style

Beers, M, H., Berkow, R. (1999). The Merck Manual of Diagnosis and Therapy (17th ed.). New York: Merck Research Laboratories.

MLA Style

Beers, Mark, H.., Berkow, Robert. "The Merck Manual of Diagnosis and Therapy". 17th ed. New York: Merck Research Laboratories, 1999. print.