@book{13704,
	author = {Hoffmann, Laurence D.},
	title = {Calculus for business, economics, and the social and life sciences / Laurence D.Hoffmann, Gerald L.Bradley.},
	publisher = {Boston : McGraw-Hill, c2007.},
	address = {Boston : McGraw-Hill, c2007.},
	edition = {9th ed.}
}