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.95, UPNE
John Adams (1794). “A Defence of the Constitutions of Government of the United States of America: Against the Attack of M. Turgot in His Letter to Dr. Price, Dated the Twenty-second Day of March, 1778”, p.385