@book{1060,
	author = {Choppin, Gregory R. and Johnsen, Russell H.},
	title = {Introductory chemistry },
	publisher = {Addison-Wesley Educational Publishers Inc,},
	year = {1972.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/0201010224/chopaconline-20}
}