@book{3121,
	author = {Leithold, Louis.},
	title = {The Calculus of a Single Variable With Analytic Geometry },
	publisher = {Happer and Row  },
	year = {1990.},
	address = {New York},
	edition = {6th},
	url = {http://www.amazon.com/exec/obidos/ASIN/0060439300/chopaconline-20}
}