@book{30081,
	author = {Tchobanoglous, George and Metcalf & Eddy.},
	title = {Wastewater engineering :},
	publisher = {McGraw-Hill,},
	year = {c2003.},
	series = {McGraw-Hill series in civil and environmental engineering},
	address = {Boston :},
	edition = {4th ed. /},
	url = {http://www.loc.gov/catdir/description/mh021/2001053724.html}
}