Ellen D'Oench "Copper into Gold": Prints by John Raphael Smith, 1751–1812. New Haven and London, 1999, cat. no. 130, pp. 81, 204.
John Chaloner Smith British Mezzotinto Portraits...from the introduction of the art to the early part of the present century. Henry Sotheran & Company, vols. 1-4, 1878–83, vol. III, p. 1306, no. 162 i.
Henry Percy Horne An Illustrated Catalogue of Engraved Portraits and Fancy Subjects painted by Thomas Gainsborough, RA...and by George Romney...with the Variations of the State of the Plates. London, 1891.
Julia Frankau John Raphael Smith: His Life and Works. London, 1902, cat. no. 346 i/ii, pp. 228-9.
Charles E. Russell English Mezzotinto Portraits and Their States. vol. II, London and New York, 1926, cat. no. 162 i/ii, p. 304.