Environmental Careers Organization & ebrary, Inc. (2004). The ECO guide to careers that make a difference. Island Press.
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Chicago Style (17th ed.) Zitazioa
Environmental Careers Organization eta Inc ebrary. The ECO Guide to Careers That Make a Difference. Washington: Island Press, 2004.
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MLA (9th ed.) Zitazioa
Environmental Careers Organization eta Inc ebrary. The ECO Guide to Careers That Make a Difference. Island Press, 2004.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.