Thomas Hobbes (1750). “The Moral and Political Works of Thomas Hobbes of Malmesbury: Never Before Collected Together : To which is Prefixed, the Author's Life, Extracted from that Said to be Written by Himself, ...”, p.119
Dorothea Lange, Paul Schuster Taylor, Howard M. Levin, Katherine Northrup (1980). “Dorothea Lange: Farm Security Administration photographs, 1935-1939 : from the Library of Congress”, Text-Fiche Pr
David Hume (1825). “Essays and treatises on several subjects: An inquiry concerning human understanding. A dissertation on the passions. An inquiry concerning the principles of morals. The natural history of religion”, p.258