Nelson, R. (2009). The greatest sales training in the world. Jaico Publishing House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNelson, Robert. The Greatest Sales Training in the World. Ahmedabad: Jaico Publishing House, 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNelson, Robert. The Greatest Sales Training in the World. Jaico Publishing House, 2009.
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