Berman Saul J. (2011). Not For Free: Revenue Strategies for a new world. Harvard Business Review Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBerman Saul J. Not For Free: Revenue Strategies for a New World. Boston: Harvard Business Review Press, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBerman Saul J. Not For Free: Revenue Strategies for a New World. Harvard Business Review Press, 2011.
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