@book{29234,
	author = {Enger Eldon D. and Smith, Bradley Fraser.},
	title = {Environmental science :},
	publisher = {McGraw-Hill,},
	year = {c2006.},
	address = {Boston :},
	edition = {10th ed. /},
	note = {Includes index.},
	url = {www.mhhe.com}
}