TULL DONALD S. (2000). MARKETING RESEARCH: MEASUREMENT AND METHOD (6TH.). PRENTICE -HALL INTERNATIONAL, INC.
Chicago (17e ed.) BronvermeldingTULL DONALD S. MARKETING RESEARCH: MEASUREMENT AND METHOD. 6TH. NEW DELHI: PRENTICE -HALL INTERNATIONAL, INC, 2000.
MLA (9e ed.) BronvermeldingTULL DONALD S. MARKETING RESEARCH: MEASUREMENT AND METHOD. 6TH. PRENTICE -HALL INTERNATIONAL, INC, 2000.
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