Ralph Waldo Emerson (2010). “Essays and English Traits by Ralph Waldo Emerson: The Five Foot Shelf of Classics, Vol. V (in 51 Volumes)”, p.296, Cosimo, Inc.
Joseph Addison (1794). “Interesting Anecdotes, Memoirs, Allegories, Essays, and Poetical Fragments: Tending to Amuse the Fancy, and Inculcate Morality”, p.286