Schiffman, S. (1999). The 25 sales strategies: That will boost your sales today! Adams Media.
Čikaški stil citiranja (17. izdanje)Schiffman, Stephan. The 25 Sales Strategies: That Will Boost Your Sales Today! Holbrook, Mass: Adams Media, 1999.
MLA način citiranja (9. izdanje)Schiffman, Stephan. The 25 Sales Strategies: That Will Boost Your Sales Today! Adams Media, 1999.
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