Charan, R. (2008). What the Customer Wants You to Know. Penguin Group.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCharan, Ram. What the Customer Wants You to Know. New Delhi: Penguin Group, 2008.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCharan, Ram. What the Customer Wants You to Know. Penguin Group, 2008.
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