[Possibly] H. Walpole, Aedes Walpolianae; or, A description of the Collection of Pictures at Houghton-Hall in Norfolk, The Seat of the Right Honourable Sir Robert Walpole, Earl of Orford, London, 1752, p.52-53. H. Walpole, Anecdotes of Painting in England, London, 1762, II, pp. 92-93 (at Wrest Park, 1771). J. Smith, A catalogue raisonné of the works of the most eminent Dutch, Flemish and French painters, London, 1831, III, p. 138, under no. 498. M.L. Boyle, Biographical Catalogue of the Portraits at Panshanger, London, 1885, p. 381 (in the 'Large Dining-Room'). L. Cust, Anthony van Dyck: An Historical Study of his Life and Work, London, 1911, p. 282, no. 175 (Earl Cowper, Panshanger). 'Horace Walpole's Journals of Visits to Country Seats, & c.', in P. Toynbee, ed., The Walpole Society, 1927-28, XVI, p. 70 (Lord Hardwicke & the Marchioness of Grey, Wrest Park, June 1771). A. Meyer, 'Sir William Musgrave's Lists of Portraits; with an Account of Head-Hunting in the Eighteenth Century', The Walpole Society, LIV, 1988, pp. 487-88 and 500. E. Larsen, The Paintings of Anthony van Dyck, Freren, 1988, II, p. 379, no. 965 (US, Private Collection). O. Millar, 'Philip, Lord Wharton, and his collection of portraits', Burlington Magazine, CXXXVI, London, August 1994, pp. 523 and 529. A. Moore and L. Dukelskaya, ed., A Capital Collection: Houghton Hall and the Hermitage, New Haven and London, 2002, p. 448 (Grosvenor Street, in 'The Great Room Above'). O. Millar in S. Barnes, et al., Van Dyck: A Complete Catalogue of the Paintings, New Haven and London, 2004, pp. 582-83, no. IV.197, illustrated.