Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson”, p.179, Harvard University Press
Sir William Blackstone, John Fletcher Hargrave, George Sweet, Sir Richard Couch, William Newland Welsby (1852). “Commentaries on the Laws of England: In Four Books : with an Analysis of the Work”, p.3