Bernardina Sani. Letter to Katharine Baetjer. February 28, 1992, confirms the attribution to Rosalba.
Graham Reynolds with the assistance of Katharine Baetjer. European Miniatures in The Metropolitan Museum of Art. Exh. cat., The Metropolitan Museum of Art. New York, 1996, pp. 12–13, 91, 117, no. 97, colorpl. 97 and ill. p. 116, note that Rosalba was the first miniaturist to use an ivory ground, and that her visit to France from 1720 to 1721 had a decisive effect on miniature painting in that country; reject an identification of the sitter as Charles Sackville or his father, Lionel Cranfield Sackville, earl of Dorset and Middlesex.
Katharine Baetjer. "British Portraits in The Metropolitan Museum of Art." Metropolitan Museum of Art Bulletin 57 (Summer 1999), p. 23, ill. (color).
Bernardina Sani. Rosalba Carriera, 1673–1757: maestra del pastello nell'Europa "ancien régime". Turin, 2007, p. 113, no. 97, ill.