"Clemenceau, The Events of His Life as Told by Himself to His Former Secretary, Jean Martet". Book translated by Milton Waldman. Chapter 12: "Conversation with Jean Martet", 1930.
Socrates, Plato, Aristotle (1967). “Wit and Wisdom of Socrates, Plato, Aristotle: Being a Treasury of Thousands of Glorious, Inspiring and Imperishable Thoughts, Views and Observations of the Three Great Greek Philosophers, Classified Under about Four Hundred Subjects for Comparative Study”
Astronaut James Lovell’s Commencement Speech at the University of Wisconsin - Madison's winter commencement at the Kohl Center, news.wisc.edu. December 18, 2016.
"Einstein Sees Lack In Applying Science; Man Has "Not Yet Learned To Make Sensible Use Of It," He Asserts. Cites War And Machinery He Urges California Students To Seek To Put Knowledge To Good Of The Race", www.nytimes.com. February 17, 1931.
Walter Lippmann, Clinton Rossiter, James Lare (1982). “The Essential Lippmann: A Political Philosophy for Liberal Democracy”, p.233, Harvard University Press