C.G. Ratti, Epilogo della vita del fù Cav. Mengs, Genoa 1779, p. ii;
G.L. Bianconi, Elogio Storico del Cavaliere Anton Raffaele Mengs, Rome 1780 p. 16;
J.P. Doray de Longrais, Œuvres de M. Mengs, Regensburg 1782, p. 6;
M.C.F. Prange, Des Ritters Anton Raphael Mengs ersten Mahlers Karl III. König in Spanien hinterlassne Werke, Halle 1786, vol. I, pp. 35, 148-49, 152 and 223;
J.N. de Azara, Opere di Antonio Raffaello Mengs...corrette ed auementate dall'avvocato Carlo Fea, Rome 1787, pp. xvii and xlii;
A. Ponz, Viaje de España, en que se da noticia de las cosas apreciables y dignas de saberse, que hay en ella, vol. XIV, Madrid 1788, carta II, p. 50;
T. Chippendale, Inventory and Valuation of the Household Furniture of the Late Wm. Weddell Esqr. at Newby taken 16th May 1792, 1792, in the Parlour or the Dining Room;
J.N. de Azara, The works of Anthony Raphael Mengs, London 1796, p. 5;
G. Schilling, Anton Raphael Mengs' Sämmtliche hinterlassene Schriften, vol. II, 1843/44, pp. 177, 179 and 214;
F. Pecht, 'Anton Raphael Mengs', in Zeitschrift für bildende Kunst, 1879, p. 38;
M. Burrell, Thoughts for enthusiasts at Bayreuth. Unpublished journal "Voyage d'Italie", vol. IV, London 1891, p. 41;
K. Woermann, 'Ismael und Anton Raphael Mengs', in Zeitschrift für bildende Kunst, 1894, pp. 85 and 87;
D. Honisch, Anton Raphael Mengs und die Bildform des Frühklassizismus, Recklinghausen 1965, p. 128;
K. Woodbridge, 'Henry Hoare's Paradise', in The Art Bulletin, vol. XLVII, 1965, p. 106;
U. Finke, 'Mengs und England', in Sind Briten hier? Relations between British and Continental Art 1680-1880, Munich 1981, p. 71;
G. Lodge, The art and architectural patronage of William Weddell (1736-1792) of Newby Hall and his circle, doctoral diss., Leeds University 1981;
B. Fredericksen, The index of paintings sold in the British Isles during the nineteenth century. 1801-1805, vol. I, Oxford 1988, p. 455;
S. Roettgen, 'Antonio Raffaello Mengs e Raffaello - Rendiconto di un rapporto programmato', in Atti del convegno di studi 'Raffaello e l'Europa', Rome 1990, pp. 628-29;
S. Roettgen, Anton Raphael Mengs and his British Patrons, exh. cat., London 1993, pp. 14, 26, and 86-88, cat. no. 19, reproduced in colour p. 87;
A. Potts, 'Review: Anton Raphael Mengs and his British Patrons', in The Burlington Magazine, vol. CXXXV, August 1993, p. 576;
G. Sestieri, Repertorio della pittura romana della fine del Seicento e del Settecento, Turin 1994, vol. I, p. 128;
S. Roettgen, Anton Raphael Mengs 1728-1779, Munich 1999, vol. I, pp. 79-81, cat. no. 46, reproduced p. 80;
S. Roettgen, Mengs: la scoperta del neoclassico [Mengs: die Erfindung des Klassizismus], exh. cat., Munich 2001, p. 165, cat. no. 36, reproduced, and p. 167, under cat. no. 37.