Jesse Torrey (1819). “The Moral Instructor, and Guide to Virtue and Happiness: Being a Compendium of Moral Science, in Four Parts ... : with an Appendix Containing Directions for the Institution of Free Public Libraries, and Reading Societies : Designed for the Use of Families, and the Highest Classes in Common Schools and Academies”, p.186
Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.54, Graphic Arts Books