Gaya APA

Kellert, S, R. (1997). Macmillan encyclopedia of the environment vol. 4 (vol. 4). New York: Simon & Schuster macmillan.

Gaya MLA

Kellert, Stephen, R. "Macmillan encyclopedia of the environment vol. 4". vol. 4 New York: Simon & Schuster macmillan, 1997. ML.