Charan, R. (2007). What the customer wants you to know. Portfolio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCharan, Ram. What the Customer Wants You to Know. New Delhi: Portfolio, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCharan, Ram. What the Customer Wants You to Know. Portfolio, 2007.
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