@book{51030,
	author = {Hoffmann, Laurence D., and Bradley, Gerald L.,},
	title = {Calculus for business, economics, and the social and life sciences /},
	publisher = {McGraw-Hill,},
	year = {c1992.},
	address = {New York :},
	edition = {5th ed.},
	note = {Includes index.}
}