Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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