@book{10587,
	author = {Tull, Donald S.},
	title = {Marketing research /},
	publisher = {Prentice Hall,},
	year = {1993.},
	address = {[S.l.] :},
	edition = {6 Sub ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0024219320/chopaconline-20}
}