Cita APA

Charles J. Krebs. (2001). Ecology. San Francisco: Benjamin Cummings.

Chicago Style Citation

Charles J. Krebs. Ecology. San Francisco: Benjamin Cummings, 2001.

Cita MLA

Charles J. Krebs. Ecology. San Francisco: Benjamin Cummings, 2001.

Atenció: Aquestes cites poden no estar 100% correctes.