lower left in plate: Painted by Sir Joshua Reynolds; lower center in plate: Pubd. May 8th 1775; lower rightin plate: Engrav'd by R W. Dickinson; by later hand, lower center verso in graphite: P48.783
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.
- C. G. Boerner Ltd. Mezzotints from the Collection of Christopher Lennox-Boyd. London, 2001: no. 40.