"Biographies of Distinguished Scientific Men". Book by François Arago, as translated by Baden Powell, Robert Grant, and William Fairbairn, p. 365, 1859.
Nelly Sachs, George Bernard Shaw, Frans Eemil Sillanpää, René Sully-Prudhomme (1971). “Nelly Sachs, Jean-Paul Sartre, George Bernard Shaw, Frans Eemil Sillanpää, René Sully-Prudhomme”
Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.31, Skyhorse Publishing, Inc.
Michael Shermer (2011). “The Believing Brain: From Ghosts and Gods to Politics and Conspiracies---How We Construct Beliefs and Reinforce Them as Truths”, p.2, Macmillan