lower left in plate: J Zoffany pinxit; lower center in plate: Publish'd August 1st. 1773. R. Sayer Excudit; lower right in plate: R. Earlom. Sculpt; by later hand, lower left verso in graphite: P42551
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: no. 1, undesc i/ii
- Wessely, J. E. Richard Earlom: Verzeichniss seiner Radirungen und Schabkunstblätter. Hamburg, 1886, no. 102, i/ii
- 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. 34.