Cita APA (7th ed.)

Ricklefs, R. E. (1990). Ecology (3rd ed.). W. H. Freeman.

Cita Chicago (17th ed.)

Ricklefs, Robert E. Ecology. 3rd ed. New York: W. H. Freeman, 1990.

Cita MLA (9th ed.)

Ricklefs, Robert E. Ecology. 3rd ed. W. H. Freeman, 1990.