Thomas Hobbes, Alan Cromartie, Quentin Skinner (2005). “Thomas Hobbes: Writings on Common Law and Hereditary Right: A Dialogue Between a Philosopher and a Student, of the Common Laws of England. Questions Relative to Hereditary Right”, p.10, Oxford University Press
Thomas Hobbes (1750). “The Moral and Political Works To which is Prefixed the Autors Life, Extracted from that Said to be Written by Himself ... Illustr. by the Ed. - London 1750”, p.209