George A. Lucas. Journal entry. November 8, 1895 [published in "The Diary of George A. Lucas: An American Art Agent in Paris, 1857–1909." Ed. Lilian M. C. Randall. Princeton, 1979, vol. 2, p. 816].
John Clyde Oswald. Benjamin Franklin in Oil and Bronze. New York, 1926, pp. 10, 12, ill. p. 14, comments that Duplessis's portraits of Franklin are known as "fur collar" portraits.
Bryson Burroughs and Harry B. Wehle. "The Michael Friedsam Collection: Paintings." Metropolitan Museum of Art Bulletin 27, section 2 (November 1932), p. 50, call it a replica of the Friedsam portrait, noting that the success of this image was such that "the artist had to make or to have made many copies of it"; remark that nine are known.
Charles Sterling. The Metropolitan Museum of Art: A Catalogue of French Paintings. Vol. 1, XV–XVIII Centuries. Cambridge, Mass., 1955, p. 173, as one of several workshop replicas of Duplessis's 1778 portrait.
Charles Coleman Sellers. Benjamin Franklin in Portraiture. New Haven, 1962, p. 259, no. 16, notes that in 1777 Franklin was in contact with a Baron de Bissy.
Thierry Bajou in The Dictionary of Art. Ed. Jane Turner. Vol. 9, New York, 1996, p. 400.
F. Marandet in Allgemeines Künstlerlexikon: die bildenden Künstler aller Zeiten und Völker. Vol. 31, Munich, 2002, p. 57.
Jean-Paul Chabaud. Joseph-Siffred Duplessis, 1725–1802: Biographie. Mazan, 2003, p. 41.
John Ingamells. National Portrait Gallery: Mid-Georgian Portraits, 1760–1790. London, 2004, p. 173.