@book{255974,
	author = {Enger, Eldon D. and Smith, Bradley Fraser.},
	title = {Environmental science :},
	publisher = {McGraw-Hill Higher Education,},
	year = {c2004.},
	address = {Boston :},
	edition = {9th ed. /},
	url = {http://www.loc.gov/catdir/toc/fy037/2002075341.html}
}