Sewell, C., & Brown, P. B. (2002). Customers for Life: How to Turn that One-time Buyer into a Lifetime Customer. Crown.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSewell, Carl, और Paul B. Brown. Customers for Life: How to Turn That One-time Buyer into a Lifetime Customer. New York: Crown, 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSewell, Carl, और Paul B. Brown. Customers for Life: How to Turn That One-time Buyer into a Lifetime Customer. Crown, 2002.
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