Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson: Nature, addresses, and lectures”, p.128, Harvard University Press
John Dryden, John Loftis, Vinton A. Dearing (1967). “The Works of John Dryden, Volume IX: Plays: The Indian Emperour, Secret Love, Sir Martin Mar-all”, p.30, Univ of California Press