Benjamin Franklin (1987). “Poor Richard's Almanack: Being the Choicest Morsels of Wisdom, Written During the Years of the Almanack's Publication”, p.16, Peter Pauper Press, Inc.
Marcus Tullius Cicero (1855). “Cicero's Three books of offices, or moral duties: also his Cato Major, an essay on old age; Lælius, an essay on friendship; Paradoxes; Scipio's dream; and Letter to Quintus on the duties of a magistrate”, p.52
Thomas Paine (2016). “THE AGE OF REASON - Investigation of True and Fabulous Theology (Including “The Life of Thomas Paine”): Deistic Critique of Bible and Christian Church”, p.26, e-artnow