House Quotes - Page 75
Hilary McKay (2002). “Saffy's Angel”, p.12, Simon and Schuster
Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.42, Graphic Arts Books
Henry David Thoreau, Nancy L. Rosenblum (1996). “Thoreau: Political Writings”, p.24, Cambridge University Press
"Science and Hypothesis". Book by Henri Poincaré, translated by George Bruce Halsted. Chapter IX: "Hypotheses in Physics", 1913.
Goldwin Smith (1881). “Lectures and Essays”, New York : Macmillan
George Orwell (1970). “A Collection of Essays”, p.159, Houghton Mifflin Harcourt