Zikmund, William G. Essentials of marketing research / William G. Zikmund, Barry J. Babin. - 4th ed. - Mason, Ohio : South-Western/Cengage Learning, c2010. - xix, 436 p. : col. ill. ; 28 cm. Includes bibliographical references (p. 424-430) and index ISBN: 1439080909 9781439047545 9781439080900 Subjects--Topical Terms: Marketing research.