APA

Cooper B., Ross-Macdonald M. & World Wildlife Fund. (19721971). The World wildlife guide. New York: Viking Press.

Chicago

Cooper Barbara, Ross-Macdonald Malcolm and World Wildlife Fund. 19721971. The World wildlife guide. New York: Viking Press.

Harvard

Cooper B., Ross-Macdonald M. and World Wildlife Fund. (19721971). The World wildlife guide. New York: Viking Press.

MLA

Cooper Barbara, Ross-Macdonald Malcolm and World Wildlife Fund. The World wildlife guide. New York: Viking Press. 19721971.