Gaya APA

Macmillan Reuised Encyclopedia of Science 7 The Environment : Ecology, Pollution, and Agriculture. (1997). New York: Macmillan Library Reference.

Gaya MLA

Macmillan Reuised Encyclopedia of Science 7 The Environment : Ecology, Pollution, and Agriculture. Cet. 1. New York: Macmillan Library Reference, 1997. Text.