Duffy, P. (1994). Business to Business marketing. Vision.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuffy, Philip. Business to Business Marketing. Delhi: Vision, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDuffy, Philip. Business to Business Marketing. Vision, 1994.
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