@book{1252,
	author = {Cunningham, William P. and Saigo, Barbara Woodworth.},
	title = {Environmental science :A global concern},
	publisher = {William C Brown Pub,},
	year = {1997.},
	address = {[S.l.] :},
	edition = {4th. ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0697370836/chopaconline-20}
}