TULL DONALD S. (2009). MARKETING RESEARCH: MEASUREMENT AND METHOD (6TH.). PRENTICE HALL OF INDIA.
Chicago (17e ed.) BronvermeldingTULL DONALD S. MARKETING RESEARCH: MEASUREMENT AND METHOD. 6TH. NEW DELHI: PRENTICE HALL OF INDIA, 2009.
MLA (9e ed.) BronvermeldingTULL DONALD S. MARKETING RESEARCH: MEASUREMENT AND METHOD. 6TH. PRENTICE HALL OF INDIA, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.