@book{51274,
	author = {Hawkins, Del I. and Tull, Donald S.},
	title = {Essentials of marketing research /},
	publisher = {Macmillan Pub. Co. ;},
	year = {c1994.},
	address = {New York :},
	note = {Portions of this book are taken from : Marketing research / Donald S. Tull, Del I. Hawkins. 6th ed. c1993.}
}