lower left in plate: Sir Joshua Reynolds pinxt.; lower center in plate: LADY BROUGHTON. / London, Printed for Robt. Sayer No. 53 Fleet Street, published as the Act directs Augt. 10 1770.; lower right in plate: T. Watson fecit
Mrs. E. M. Hamilton (not in Lugt). Christopher Lennox-Boyd; (C. G. Boerner Limited, New York); purchased 2001 by NGA.
- Smith, John Chaloner. British mezzotinto portraits, being a descriptive catalogue of these engravings from the introduction of the art to the early part of the present century. 4 vols. London: Henry Sotheran and Co., 1884.
- Russell, Charles Edward. English Mezzotint Portraits and Their States. 2 vols. London: Halton and Truscott Smith, Ltd., 1926.