Nicolaus Copernicus, On the Revolutions of the Heavenly Spheres, trans. Edward Rosen (Baltimore: Johns Hopkins University Press, 1992), 4–5.
22
Plato, The Dialogues: The Republic, Book VII, trans. Benjamin Jowett, Great Books of the Western World, vol. 7, ed. Mortimer J. Adler, 2nd ed. (Chicago: Encyclopaedia Britannica, 1993), 389, line 517.
