Jantsch, J. (2010). Referral engine: Teaching your business to market itself. Portofolio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJantsch, John. Referral Engine: Teaching Your Business to Market Itself. London: Portofolio, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJantsch, John. Referral Engine: Teaching Your Business to Market Itself. Portofolio, 2010.
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