Leo R. Schidlof. The Miniature in Europe in the 16th, 17th, 18, and 19th Centuries. Graz, Austria, 1964, vol. 1, p. 125; vol. 3, pl. 104, fig. 193.
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, p. 163, no. 200, ill., note that "if, as seems likely, the identification of the sitter is correct, then the miniature is posthumous".
Nathalie Lemoine-Bouchard. Letter to Katharine Baetjer. November 24, 2003, points out that there is another portrait by Canon of the same sitter, dated 1829 (sale, Hôtel Drouot, Paris, June 20, 2001, no. 57).