Berkow, R., Beers, M. H., & Fletcher, A. J. (1996). The Merck manual of diagnosis and therapy. Merck Research laboratories.

Berkow, Robert, Mark H. Beers, and Andrew J. Fletcher. The Merck Manual of Diagnosis and Therapy. Rahway, N. J: Merck Research laboratories, 1996.

Berkow, Robert, et al. The Merck Manual of Diagnosis and Therapy. Merck Research laboratories, 1996.