@book{6362,
	author = {Davis, Mackenzie Leo, and Cornwell, David A.,},
	title = {Introduction to environmental engineering /},
	publisher = {McGraw-Hill Companies,},
	year = {c2009.},
	address = {Dubuque, IA :},
	edition = {4th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0665/2006049134-d.html}
}