Erisman, P. (2017). Six billion shoppers: The companies winning the global e-commerce boom (First U.S. edition.). St. Martin's Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रErisman, Porter. Six Billion Shoppers: The Companies Winning the Global E-commerce Boom. First U.S. edition. New York, N.Y.: St. Martin's Press, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रErisman, Porter. Six Billion Shoppers: The Companies Winning the Global E-commerce Boom. First U.S. edition. St. Martin's Press, 2017.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.