Pigues D Keith. (2010). Winning with Customers. John Wiley and Sons.
Čikaški stil citiranja (17. izdanje)Pigues D Keith. Winning with Customers. New Jersey: John Wiley and Sons, 2010.
MLA način citiranja (9. izdanje)Pigues D Keith. Winning with Customers. John Wiley and Sons, 2010.
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