Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.131, Graphic Arts Books
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”
"Les Confidences: Confidential Disclosures" by Alphonse de Lamartine, translated by Eugène Plunkett, New York: D. Appleton & Co., (Book IV, Note VIII, p. 60), 1857.
Henry Beston, Elizabeth Jane Coatsworth (2001). “The Best of Beston: A Selection from the Natural World of Henry Beston from Cape Cod to the St. Lawrence”, p.18, David R. Godine Publisher