APA (7th ed.) Citation

Sapolsky, R. M. (1998). Why zebras don't get ulcers: An updated guide to stress, stress-related diseases, and coping. W.H. Freeman and Co.

Chicago Style (17th ed.) Citation

Sapolsky, Robert M. Why Zebras Don't Get Ulcers: An Updated Guide to Stress, Stress-related Diseases, and Coping. New York: W.H. Freeman and Co, 1998.

MLA (9th ed.) Citation

Sapolsky, Robert M. Why Zebras Don't Get Ulcers: An Updated Guide to Stress, Stress-related Diseases, and Coping. W.H. Freeman and Co, 1998.