after Johan Joseph Zoffany RA, 1733–1810, German, active in Britain (from 1760)
John Chaloner Smith, British mezzotinto portraits, being a descriptive catalogue of these engravings from the introduction of the art to the early part of the present century : arranged according to the engravers, the inscriptions given at full length, and the variations of state precisely set forth : acc , Martino Pub., Mansfield Centre, CT, 2004, v.2, p. 554, Green no. 47, NE1816.G7 S58 2004
Mary Webster, Johan Zoffany, 1733-1810, National Portrait Gallery, London, 1976, p. 45, no. 48, NJ18 Z68 W43 (YCBA)