Cita APA (7a ed.)

Western, D., & Pearl, M. C. (1989). Conservation: For the twenty-first century. Oxford University Press.

Cita Chicago Style (17a ed.)

Western, David, y Mary C. Pearl. Conservation: For the Twenty-first Century. London [etc.]: Oxford University Press, 1989.

Cita MLA (9a ed.)

Western, David, y Mary C. Pearl. Conservation: For the Twenty-first Century. Oxford University Press, 1989.