Albert Einstein, Harry Woolf (1980). “Some strangeness in the proportion: a centennial symposium to celebrate the achievements of Albert Einstein”, Addison Wesley Publishing Company
"Belief & Technique For Modern Prose: List of Essentials" in a letter to Arabelle Porter (28 May 1955); published in "Jack Kerouac: Selected Letters 1940-1956" by Jack Kerouac, 1995.
Friedrich Nietzsche, Bernard Williams, Josefine Nauckhoff (2001). “Nietzsche: The Gay Science: With a Prelude in German Rhymes and an Appendix of Songs”, p.199, Cambridge University Press