APA (7th ed.) Zitazioa

Pepper, D. (1997). Modern environmentalism: An introduction. Routledge.

Chicago Style (17th ed.) Zitazioa

Pepper, David. Modern Environmentalism: An Introduction. --New York: Routledge, 1997.

MLA (9th ed.) Zitazioa

Pepper, David. Modern Environmentalism: An Introduction. Routledge, 1997.