Citazione Stile APA (7a Edizione)

Kellert, S. R. (1997). Macmillan encyclopedia of the environment. Macmillan Library Reference.

Citazione stile Chigago Style (17a edizione)

Kellert, Stephen R. Macmillan Encyclopedia of the Environment. New York: Macmillan Library Reference, 1997.

Citatione MLA (9a ed.)

Kellert, Stephen R. Macmillan Encyclopedia of the Environment. Macmillan Library Reference, 1997.