Cita APA (7th ed.)

Sapolsky, R. M. (2004). Why zebras don't get ulcers (Third edition.). Times Books.

Cita Chicago (17th ed.)

Sapolsky, Robert M. Why Zebras Don't Get Ulcers. Third edition. New York: Times Books, 2004.

Cita MLA (9th ed.)

Sapolsky, Robert M. Why Zebras Don't Get Ulcers. Third edition. Times Books, 2004.