Adam Smith (1843). “An Inquiry Into the Nature and Causes of the Wealth of Nations With a Life of the Author: Also a View of the Doctrine of Smith, Compared with that of the French Economists, with a Method of Facilitating the Study of His Works, from the French of M. Jariner”, p.7
Jack London (2017). “Jack London for Kids – Breathtaking Adventure Tales & Animal Stories (Illustrated Edition): Children’s Book Classics, Including The Call of the Wild, White Fang, Jerry of the Islands, The Cruise of the Dazzler, Michael Brother of Jerry & Before Adam”, p.134, e-artnow
John Locke (1728). “Two Treatises of Government: In the Former the False Principles & Foundation of Sir Robert Filmer & His Followers, are Detected & Overthrown; the Latter is an Essay Concerning the True Original, Extent & End of Civil Government”, p.49