Gaya APA

Kellert, S, R. (1997). Macmillan encyclopedia of the environment.vol 1 (vol. 1). New York: Simon & Schuster macmillan.

Gaya MLA

Kellert, Stephen, R. "Macmillan encyclopedia of the environment.vol 1". vol. 1 New York: Simon & Schuster macmillan, 1997. .