Dixon Matthew. (2012). Challenger Sale: Taking Control of the Customer Conversation. Portfolio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDixon Matthew. Challenger Sale: Taking Control of the Customer Conversation. London: Portfolio, 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDixon Matthew. Challenger Sale: Taking Control of the Customer Conversation. Portfolio, 2012.
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