Cita APA (7th ed.)
Callenbach, E. (2008). Ecology: A pocket guide (Rev. ed., 10th anniversary ed.). University of California Press.
Cita Chicago (17th ed.)
Callenbach, Ernest. Ecology: A Pocket Guide. Rev. ed., 10th anniversary ed. Berkeley: University of California Press, 2008.
Cita MLA (9th ed.)
Callenbach, Ernest. Ecology: A Pocket Guide. Rev. ed., 10th anniversary ed. University of California Press, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.