The Frick Collection: An Illustrated Catalogue, Princeton 1968, vol. I, p. 110 (as a copy);

D. Buttery, "George Romney and the second Earl of Warwick," in Apollo, August 1986, p. 108 (as a preliminary study by Romney);

K.S. Wood, "Romney Revealed: Re-Discovering Lord Warwick's Children," in Transactions of the Romney Society, vol. 12, 2007, pp. 9-10, reproduced p. 14, fig. 6 (as George Romney(?));

A. Kidson, George Romney: Complete Catalogue of his Paintings, New Haven and London 2015, vol. II, pp. 618-619, cat. no. 1385c, reproduced in black and white (as not autograph and as a later replica derived from the large original).