Invoice from Wilson 5 June 1770, National Library of Wales, Box 115; Booth Notes Doc. 4, p. 2; Booth Notes Doc. 5, p. 1; probably Catalogue 1814, p. 19 or 20; Waterhouse 1946, p. 227; WGC, pp. 47, 88, 184, pl. 53b; Constable 1954, p. 140; The Faringdon Collection, Buscot Park, 1975, p. 11, no. 18