Cita APA

Western, D., & Pearl, M. (1989). Conservation for the Twenty-First Century. New York: Oxford University Press.

Citación estilo Chicago

Western, David, y Mary Pearl. Conservation for the Twenty-First Century. New York: Oxford University Press, 1989.

Cita MLA

Western, David, y Mary Pearl. Conservation for the Twenty-First Century. New York: Oxford University Press, 1989.