Cita APA (7a ed.)

Sapolsky, R. M., & Berkrot, P. (2012). Why zebras don't get ulcers (Unabridged.). Tantor Audio : Made available through hoopla.

Cita Chicago Style (17a ed.)

Sapolsky, Robert M., y Peter Berkrot. Why Zebras Don't Get Ulcers. Unabridged. [United States]: Tantor Audio : Made available through hoopla, 2012.

Cita MLA (9a ed.)

Sapolsky, Robert M., y Peter Berkrot. Why Zebras Don't Get Ulcers. Unabridged. Tantor Audio : Made available through hoopla, 2012.