Παραπομπή σε μορφή APA (7η εκδ.)

Callicott, J. B. (1989). In defense of the land ethic: Essays in environmental philosophy. State University of New York Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Callicott, J. Baird. In Defense of the Land Ethic: Essays in Environmental Philosophy. Albany, N.Y.: State University of New York Press, 1989.

Παραπομπή σε μορφή MLA (9th εκδ.)

Callicott, J. Baird. In Defense of the Land Ethic: Essays in Environmental Philosophy. State University of New York Press, 1989.