E[llis]. K. Waterhouse. "Preliminary Check List of Portraits by Thomas Gainsborough." Walpole Society 33 (1953), p. 61, notes—in error—that according to Anna Wells Rutledge the painting had been destroyed in a fire in California.
Ellis Waterhouse. Gainsborough. London, 1958, p. 75, confuses it with another portrait that descended to Mrs. Henry Fulton, notes—in error—that it had been destroyed, and dates it probably to the 1770s.
Anna Wells Rutledge. Artists in the Life of Charleston: Through Colony and State from Restoration to Reconstruction. reprint of 1949 ed., with a new preface. Columbia, S.C., 1980, p. 116, quotes a letter of 1774 from Ralph Izard to a friend in which the former mentions the portrait; draws attention to the fact that it is also listed in a codicil to Izard's will.
Angela D. Mack in In Pursuit of Refinement: Charlestonians Abroad, 1740–1860. Exh. cat., Gibbes Museum of Art, Charleston, S.C. Columbia, S.C., 1999, pp. 31, 112–15, no. 11, colorpl. p. 113.
Katharine Baetjer. British Paintings in The Metropolitan Museum of Art, 1575–1875. New York, 2009, pp. 92–94, no. 40, ill. (color).
Old Master Paintings. Sotheby's, New York. June 5, 2014, p. 122, under no. 99.