Zikmund, William G. Essentials of marketing research / William G. Zikmund and Barry J. Babin - 5th ed. - Australia : South-Western Cengage Learning, c2013. - xxiv, 452 p. : ill. ; 28 cm. ISBN: 9781133273431 LCCN: Subjects--Topical Terms: Marketing research LC Class. No.: HF5415.2 / .Z537 2013