Gaya APA

Kellert, S, R. et al (1997). Macmillan encyclopedia of the environment [vol. 6] (Vol. 6). London: Simon and Schuster and Prentice Hall Iternational.

Gaya MLA

Kellert, Stephen, R. et al. "Macmillan encyclopedia of the environment [vol. 6]". Vol. 6 London: Simon and Schuster and Prentice Hall Iternational, 1997. Text.