Pigues D Keith. (2010). Winning with Customers. John Wiley and Sons.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPigues D Keith. Winning with Customers. New Jersey: John Wiley and Sons, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPigues D Keith. Winning with Customers. John Wiley and Sons, 2010.
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