Sack, S. M. (1981). The salesperson's legal guide. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Sack, Steven Mitchell. The Salesperson's Legal Guide. Prentice Hall, 1981.
Lua MLA (9ú heag.)Sack, Steven Mitchell. The Salesperson's Legal Guide. Prentice Hall, 1981.
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