F. M. "König Leopolds Verkäufe." Der Cicerone 1 (1909), pp. 333–34, as an insignificant work by Rubens.
W. Roberts. "The King of the Belgians' Collection of Old Masters." Connoisseur 24 (August 1909), pp. 206–7, ill., as by Rubens.
"Notes on Various Works of Art: Pictures Lately in the Collection of the King of the Belgians." Burlington Magazine 15 (July 1909), p. 238, ill. p. 242, as by Rubens, and as superior to the Montpellier version.
Wilhelm von Bode. The Collection of Pictures of the late Herr A. de Ridder in his Villa at Schönberg near Cronberg in the Taunus. Berlin, 1913, p. 17, pl. 73 [catalogue section unpaginated], attributes it to Rubens, calling the Montpellier version a replica.
R[udolf]. Oldenbourg. Die Flämische Malerei des XVII. Jahrhunderts. Berlin, 1922, p. 66, fig. 29, as by Van Dyck, and strongly influenced by Rubens.
Wilhelm R. Valentiner in The Michael Friedsam Collection. [completed 1928], p. 129, as by Rubens; dates it about 1620, and calls the Montpellier version a replica.
Bryson Burroughs and Harry B. Wehle. "The Michael Friedsam Collection: Paintings." Metropolitan Museum of Art Bulletin 27, section 2 (November 1932), p. 42, no. 73, list it as by Rubens, but note that the attribution either to him or to Van Dyck remains in doubt.
Karla Langedijk. "Ein Bildnis Frans Franckens I., gemalt von Frans Pourbus dem Jüngeren, in den Uffizien zu Florenz." Mitteilungen des Kunsthistorischen Institutes in Florenz 9 (November 1960), p. 259 n. 6, calls it a copy of the Montpellier picture; identifies the sitter as Frans Francken I.
Horst Vey. Die Zeichnungen Anton van Dycks. Brussels, 1962, text vol., p. 319, under no. 252.
Erik Larsen. L'opera completa di Van Dyck. Milan, 1980, vol. 2, p. 132, no. A64, ill. p. 131, calls it a nineteenth-century imitation of the original in Montpellier.
Walter A. Liedtke. Flemish Paintings in The Metropolitan Museum of Art. New York, 1984, vol. 1, pp. 224–26; vol. 2, pl. 85, as a portrait of Frans Francken I; calls this picture and the oval version in the Musée Fabre, Montpellier, very probably good workshop replicas of a lost original by Rubens.
Ursula Härting. Frans Francken der Jüngere (1581–1642). Freren, Germany, 1989, pp. 21, 195 n. 125, as a copy after a lost original by Rubens.
Walter Liedtke. Letter to Ursula Härting. December 9, 1994, based on Hubert von Sonnenburg's analysis, suggests a tentative attribution to an unknown Antwerp master, perhaps following a lost original by Van Dyck.
Olivier Zeder in Tableaux flamands et hollandais du Musée Fabre de Montpellier. Exh. cat., Institut Néerlandais. Paris, 1998, pp. 171–72, fig. 46b, under no. 46.