Environmental Careers Organization & ebrary, Inc. (2004). The ECO guide to careers that make a difference. Island Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEnvironmental Careers Organization और Inc ebrary. The ECO Guide to Careers That Make a Difference. Washington: Island Press, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEnvironmental Careers Organization और Inc ebrary. The ECO Guide to Careers That Make a Difference. Island Press, 2004.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.