Johnson, S. (2014). How we got to now: Six innovations that made the modern world. Riverhead Books, a member of Penguin Group (USA).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Johnson, Steven. How We Got to Now: Six Innovations That Made the Modern World. New York: Riverhead Books, a member of Penguin Group (USA), 2014.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Johnson, Steven. How We Got to Now: Six Innovations That Made the Modern World. Riverhead Books, a member of Penguin Group (USA), 2014.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.