APA (7th ed.) Zitazioa

Environmental Careers Organization & ebrary, Inc. (2004). The ECO guide to careers that make a difference. Island Press.

Chicago Style (17th ed.) Zitazioa

Environmental Careers Organization eta Inc ebrary. The ECO Guide to Careers That Make a Difference. Washington: Island Press, 2004.

MLA (9th ed.) Zitazioa

Environmental Careers Organization eta Inc ebrary. The ECO Guide to Careers That Make a Difference. Island Press, 2004.