@book{140139,
	author = {Green, Paul E. and Tull, Donald S.},
	title = {Research for marketing decisions /},
	publisher = {Prentice Hall,},
	year = {c1988.},
	series = {The Prentice Hall series in marketing},
	address = {Englewood Cliffs, N.J. :},
	edition = {5th ed.}
}