Greenberg, P. (2004). CRM at the Speed of Light (3rd.). Tata Mcgraw Hill pub. co.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGreenberg, Paul. CRM at the Speed of Light. 3rd. New Dehli: Tata Mcgraw Hill pub. co, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGreenberg, Paul. CRM at the Speed of Light. 3rd. Tata Mcgraw Hill pub. co, 2004.
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