@book{113,
	author = {Cunningham, William P. and Cunningham, Mary Ann.},
	title = {Environmental science :},
	publisher = {McGraw-Hill Higher Education,},
	year = {c2007.},
	address = {Boston :},
	edition = {9th ed. /},
	url = {http://www.loc.gov/catdir/toc/ecip0517/2005022883.html}
}