APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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