Sack, S. M. (1981). The salesperson's legal guide. Prentice Hall.
Chicago-čujuhus (17. p.)Sack, Steven Mitchell. The Salesperson's Legal Guide. Prentice Hall, 1981.
MLA-čujuhus (9. p.)Sack, Steven Mitchell. The Salesperson's Legal Guide. Prentice Hall, 1981.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.