MERCER DAVID. (1988). SALES: PROFESSIONAL STRATEGIES AND TECHNIQUES...HIGH LEVEL SALES. KOGAN PAGE.
Čikaški stil citiranja (17. izdanje)MERCER DAVID. SALES: PROFESSIONAL STRATEGIES AND TECHNIQUES...HIGH LEVEL SALES. LONDON: KOGAN PAGE, 1988.
MLA način citiranja (9. izdanje)MERCER DAVID. SALES: PROFESSIONAL STRATEGIES AND TECHNIQUES...HIGH LEVEL SALES. KOGAN PAGE, 1988.
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