TULL DONALD S. (1987). MARKETING RESEARCH: MEASUREMENT AND METHOD (4.). MACMILLAN.
Chicago-čujuhus (17. p.)TULL DONALD S. MARKETING RESEARCH: MEASUREMENT AND METHOD. 4. NEW YARK: MACMILLAN, 1987.
MLA-čujuhus (9. p.)TULL DONALD S. MARKETING RESEARCH: MEASUREMENT AND METHOD. 4. MACMILLAN, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.