Environmental Careers Organization & ebrary, Inc. (2004). The ECO guide to careers that make a difference. Island Press.
芝加哥风格引文Environmental Careers Organization 与 Inc ebrary. The ECO Guide to Careers That Make a Difference. Washington: Island Press, 2004.
MLA引文Environmental Careers Organization 与 Inc ebrary. The ECO Guide to Careers That Make a Difference. Island Press, 2004.
警告：这些引文格式不一定是100％准确.