Johnson, S. (2014). How we got to now: Six innovations that made the modern world. Riverhead Books, a member of Penguin Group (USA).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Steven. How We Got to Now: Six Innovations That Made the Modern World. New York: Riverhead Books, a member of Penguin Group (USA), 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohnson, Steven. How We Got to Now: Six Innovations That Made the Modern World. Riverhead Books, a member of Penguin Group (USA), 2014.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.