Hoffeld, D. (2016). The science of selling: Proven strategies to make your pitch, influence decisions, and close the deal. TarcherPerigee.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHoffeld, David. The Science of Selling: Proven Strategies to Make Your Pitch, Influence Decisions, and Close the Deal. New York: TarcherPerigee, 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHoffeld, David. The Science of Selling: Proven Strategies to Make Your Pitch, Influence Decisions, and Close the Deal. TarcherPerigee, 2016.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.