Scientist
Einstein, Albert. "Letter to Dr. H. L. Gordon." Quoted in Einstein: His Life and Universe, by Walter Isaacson. Simon & Schuster, 2007. Originally from Letter to Dr. H. L. Gordon, 3 May 1949.
Hawking, Steven. A Brief History of Time: From the Big Bang to Black Holes. Bantam Dell Publishing Group, 1988, conclusion.
Huxley, Thomas Henry. "A Liberal Education." 1868, Working Men's College, London, England, UK.
Huxley, Thomas Henry. "The Coming of Age of The Origin of Species." 19 Mar. 1880, Royal Institution, London, England, UK. Lecture.
Georges Louis Leclerc de Buffon
On horses.
Buffon, Georges Louis Leclerc. "Le Cheval [The Horse]." Histoire Naturelle generale et particuliere, avec la description du Cabinet du Roi [Natural History, General and Particular, with a Description of the King's Cabinet]. Vol. 4, c. 1753.
Spencer, Herbert. "Progress: Its Law and Cause." Essays on Education and Kindred Subjects. London and Edinburgh: Williams and Norgate, 1861. Originally published in The Westminster Review, Apr. 1857.
State Tamperings with Money and Banks
Spencer, Herbert. "State Tamperings with Money and Banks." The Westminster Review, Jan. 1858.
Spencer, Herbert. "State Tamperings with Money and Banks." Essays, Scientific, Political, and Speculative. Vol. 3, Cornell University Library, 2009.
Rutherford, Ernest. Quoted in Rutherford at Manchester, by J. B. Birks. Heywood and Company, 1962.
Gould, Stephen Jay. "Velikovsky In Collision." Natural History, Mar. 1975.
Hubble, Edwin. “The Exploration of Space.” Harper’s Magazine, May 1929.
Bragg, William Henry. "Sound in War." c. Christmas 1919, The Royal Institution, Westminster, London, England, UK. Lecture.
Penrose, Roger. The Emperor's New Mind: Concerning Computers, Minds and The Laws of Physics. Oxford University Press, 1989, ch. 10.
Dawkins, Richard. The Blind Watchmaker. Norton & Company, 1986, ch. 1.
Gould, Stephen Jay. "Evolution as Fact and Theory." Hen's Teeth and Horse's Toes. W. W. Norton & Company, 1983, ch. 19.