APA (7th ed.) Citation

Ricklefs, R. E. (2001). The economy of nature (5. ed.). Freeman.

Chicago Style (17th ed.) Citation

Ricklefs, Robert E. The Economy of Nature. 5. ed. New York: Freeman, 2001.

MLA (9th ed.) Citation

Ricklefs, Robert E. The Economy of Nature. 5. ed. Freeman, 2001.