Benjamin Franklin (1987). “Poor Richard's Almanack: Being the Choicest Morsels of Wisdom, Written During the Years of the Almanack's Publication”, p.49, Peter Pauper Press, Inc.
sir John Barnard, Benjamin Franklin (1848). “A present for an apprentice [by sir J. Barnard]. To which is added, Franklin's Way to wealth. [Ed.] by a citizen of London [T. Tegg].”, p.288
Abigail Adams, John Adams, L. H. Butterfield, Marc Friedlaender, Mary-Jo Kline (1975). “The Book of Abigail and John: Selected Letters of the Adams Family, 1762-1784”, p.113, UPNE