@book{1250,
	author = {Sherman, Alan.},
	title = {Basic concepts of chemistry },
	publisher = {Houghton Mifflin,},
	year = {1980.},
	address = {[S.l.] :},
	edition = {2nd ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0395281539/chopaconline-20}
}