Keenan, S., & Johnson, S. (2018). How we got to now: Six innovations that made the modern world. Viking.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKeenan, Sheila, और Steven Johnson. How We Got to Now: Six Innovations That Made the Modern World. New York, New York: Viking, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKeenan, Sheila, और Steven Johnson. How We Got to Now: Six Innovations That Made the Modern World. Viking, 2018.
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