Robinson William A. (1997). Best Sales Promotions. NTC Books.
Chicago-čujuhus (17. p.)Robinson William A. Best Sales Promotions. USA: NTC Books, 1997.
MLA-čujuhus (9. p.)Robinson William A. Best Sales Promotions. NTC Books, 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.