Cita APA (7a ed.)

Krausman, P. R., & Valdez, R. (1999). Mountain Sheep of North America. University of Arizona Press.

Cita Chicago Style (17a ed.)

Krausman, Paul R., y Raul Valdez. Mountain Sheep of North America. Tucson: University of Arizona Press, 1999.

Cita MLA (8a ed.)

Krausman, Paul R., y Raul Valdez. Mountain Sheep of North America. University of Arizona Press, 1999.