Ricklefs, R. E. (1973). Ecology. Nelson.
Cita Chicago (17th ed.)Ricklefs, Robert E. Ecology. London: Nelson, 1973.
Cita MLA (9th ed.)Ricklefs, Robert E. Ecology. Nelson, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)