Katharine Grant Sterne. "The French Primitives in the Friedsam Collection." Parnassus 4 (January 1932), p. 9, calls it a portrait of Henri III by Etienne de Moustier.
Millia Davenport. The Book of Costume. New York, 1948, vol. 2, p. 481, no. 1282, ill. p. 480 (cropped).
Charles Sterling. The Metropolitan Museum of Art: A Catalogue of French Paintings. Vol. 1, XV–XVIII Centuries. Cambridge, Mass., 1955, pp. 59–60, ill., catalogues it as by "Monogrammist LAM, 1568–1574"; comments on the excellent painting of the head and suggests the hands and body were painted by an assistant; identifies the subject as apparently a courtier of Charles IX or Henry III; notes that a photograph was recently discovered of a similar picture that once belonged to a private collection in France; this picture, he notes, was a half-length portrait of a man, bore the same signature as ours, and was dated 1568, but was more consistent in execution.
Harold Koda. Extreme Beauty: The Body Transformed. Exh. cat., The Metropolitan Museum of Art. New York, 2001, p. 110, ill. (color, cropped).