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.81, Harvard University Press
Joseph Addison, Sir Richard Steele (1832). “The British Essayists: Containing the Spectator, with Notes and General Index, and the Tatler and Guardian, with Notes and General Index”