APA

Grzimek B., Illies J. & Klausewitz W. (1976). Grzimek's encyclopedia of ecology. New York: Van Nostrand Reinhold.

Chicago

Grzimek Bernhard, Illies Joachim and Klausewitz Wolfgang. 1976. Grzimek's encyclopedia of ecology. New York: Van Nostrand Reinhold.

Harvard

Grzimek B., Illies J. and Klausewitz W. (1976). Grzimek's encyclopedia of ecology. New York: Van Nostrand Reinhold.

MLA

Grzimek Bernhard, Illies Joachim and Klausewitz Wolfgang. Grzimek's encyclopedia of ecology. New York: Van Nostrand Reinhold. 1976.