Benjamin Franklin (1838). “The life of Benjamin Franklin: to which are added Essays by the same Author : Mit einem Wörterbuch ; Zum Schul- u. Privatgebrauch”, p.2
Benjamin Franklin (1987). “Poor Richard's Almanack: Being the Choicest Morsels of Wisdom, Written During the Years of the Almanack's Publication”, p.41, Peter Pauper Press, Inc.