Edwards 1808, p. 78; WGC, p. 153, pls 5a & 5b; J. Kerslake Early Georgian Portraits, 1977, p. 9; Connoisseur, September 1977, p. 71; Sale cat., The Lyttelton Papers, Sotheby's London, 12 December 1978 p. 101 (cat. 79); J. Cornforth, 'A New Direction at Beningbrough', Country Life, CLXV, June 7 1979, pp. 1856-7, repr.; A. Ribeiro, The Gallery of Fashion, 2000, p. 116; J. Ingamells, Mid-Georgian Portraits 1760-1790, 2004, p. 191; D. Saywell & J. Simon, eds., Complete Illustrated Catalogue, National Portrait Gallery, London, 2004, p. 711