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. II, p. 519, no. 8.
Freeman O'Donoghue Catalogue of Engraved British Portraits Preserved in the Department of Prints and Drawings in the British Museum. vols. 1-5, London, 1908–22, vol. IV, p. 550, no. 1.