Johnson, S., & Newbern, G. (2014). How we got to now: Six innovations that made the modern world (Unabridged.). Penguin Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Steven, और George Newbern. How We Got to Now: Six Innovations That Made the Modern World. Unabridged. New York: Penguin Audio, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohnson, Steven, और George Newbern. How We Got to Now: Six Innovations That Made the Modern World. Unabridged. Penguin Audio, 2014.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.