TULL DONALD S. (2009). MARKETING RESEARCH: MEASUREMENT AND METHOD (6TH.). PRENTICE HALL OF INDIA.
Chicago-čujuhus (17. p.)TULL DONALD S. MARKETING RESEARCH: MEASUREMENT AND METHOD. 6TH. NEW DELHI: PRENTICE HALL OF INDIA, 2009.
MLA-čujuhus (9. p.)TULL DONALD S. MARKETING RESEARCH: MEASUREMENT AND METHOD. 6TH. PRENTICE HALL OF INDIA, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.