PEPPERS DON. (2004). MANAGING CUSTOMER RELATIONSHIP. JOHN WILEY AND SONS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPEPPERS DON. MANAGING CUSTOMER RELATIONSHIP. NEW JERSEY: JOHN WILEY AND SONS, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPEPPERS DON. MANAGING CUSTOMER RELATIONSHIP. JOHN WILEY AND SONS, 2004.
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