@book{60580, author = {Eddy,Metcalf and Tchobanoglous, George and Metcalf & Eddy.}, title = {Wastewater engineering }, publisher = {McGraw-Hill}, year = {c2003.}, address = {Boston }, edition = {4th ed}, url = {http://www.loc.gov/catdir/description/mh021/2001053724.html} }