APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Western, David, and Mary C. Pearl. Conservation for the Twenty-first Century. New York: Oxford University Press, 1989.

MLA (9th ed.) Citation

Western, David, and Mary C. Pearl. Conservation for the Twenty-first Century. Oxford University Press, 1989.