John Adams, Charles Francis Adams (1851). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.438
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.58, UPNE
Quoted in Susan Boylston Adams Clark, Letter to Abigail Louisa Smith Adams Johnson, 9 July 1826. In fact, Jefferson had died a few hours earlier on this, the fiftieth anniversary of the Declaration of Independence. Eliza Quincy, in her 1861 memoirs, wrote that the last words Adams spoke distinctly were "Thomas Jefferson"; the rest of the sentence, she noted, was inarticulate. See Jefferson 55