Tull, D. S. (2002). Marketing research: Measurement & method (6th ed.). Prentice hall od India.
Chicago Style citaatTull, Donald S. Marketing Research: Measurement & Method. 6th ed. New Delhi: Prentice hall od India, 2002.
MLA citatieTull, Donald S. Marketing Research: Measurement & Method. 6th ed. Prentice hall od India, 2002.
Let op: Deze citaties zijn niet altijd 100% accuraat.