@book{206,
	author = {Cunningham, William P. and Cunningham, Mary Ann.},
	title = {Principles of environmental science :},
	publisher = {McGraw-Hill,},
	year = {c2006.},
	address = {Dubuque, IA :},
	edition = {3rd ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/toc/ecip052/2004024617.html}
}