Real Quotes - Page 81
Auguste Comte, John Henry Bridges (1865). “A General View of Positivism”, p.387, London, Trübner and Company
"Physics and Philosophy: The Revolution in Modern Science". Book by Werner Heisenberg, 1958.
"The Light Fantastic". Book by Terry Pratchett, 1986.
Richelle Mead (2008). “Shadow Kiss: A Vampire Academy Novel”, p.91, Penguin