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Lua i Stíl Chicago (17ú heag.)CRON W L. SALES MANAGEMENT: CONCEPTS AND CASES. 7TH. NEW YORK: JOHN WILEY AND SONS, 2003.
Lua MLA (9ú heag.)CRON W L. SALES MANAGEMENT: CONCEPTS AND CASES. 7TH. JOHN WILEY AND SONS, 2003.
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