APA (7th ed.) Citation

Ricklefs, R. E. (1993). The economy of nature: A textbook in basic ecology (3. ed.). Freeman.

Chicago Style (17th ed.) Citation

Ricklefs, Robert E. The Economy of Nature: A Textbook in Basic Ecology. 3. ed. New York: Freeman, 1993.

MLA (9th ed.) Citation

Ricklefs, Robert E. The Economy of Nature: A Textbook in Basic Ecology. 3. ed. Freeman, 1993.