Benjamin Franklin (1987). “Poor Richard's Almanack: Being the Choicest Morsels of Wisdom, Written During the Years of the Almanack's Publication”, p.14, Peter Pauper Press, Inc.
Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.53, Graphic Arts Books
Estwick EVANS (1819). “A Pedestrian Tour of four thousand miles throught the Western States and Territories during the winter and spring of 1818. Interspersed with Reflections”, p.102