lower left in plate: Painted by R. Wright; lower right in plate: Engraved by T. Watson; lower center in plate: London Publifh'd Feby.20th.1781, for Watfon & Dickinfon No.158.New Bond Street.
- 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.
- Goodwin, Gordon. Thomas Watson, James Watson, Elizabeth Judkins. London, 1904, 65.
- Clayton (date?), 21.