BOYD,WESTFALL. (1990). MARKETING RESEARCH. RICHARD D. IRWIN.
Chicago-čujuhus (17. p.)BOYD,WESTFALL. MARKETING RESEARCH. RICHARD D. IRWIN, 1990.
MLA-čujuhus (9. p.)BOYD,WESTFALL. MARKETING RESEARCH. RICHARD D. IRWIN, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.