Ralph Waldo Emerson (2010). “Essays and English Traits by Ralph Waldo Emerson: The Five Foot Shelf of Classics, Vol. V (in 51 Volumes)”, p.133, Cosimo, Inc.
Plutarch (1909). “Plutarch's essays and miscellanies, comprising all the works collected under the title of "Morals", translated from the Greek by several hands, corr. and rev. by William W. Goodwin”