Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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