"The Princess and the Patriot: Ekaterina Dashkova, Benjamin Franklin, and the Age of Enlightenment," American Philosophical Society, Philadelphia PA, USA, 2/11/2006 - 12/31/2006.
Savill, Rosalind, The Wallace Collection Catalogue of Sevres Porcelain (Antique Collectors Club, 2003) . This reference was kindly provided by independent scholar Letitia Roberts.
Schiff, Stacy, A Great Improvisation : Franklin, France, and the Birth of America, (New York : Henry Holt & Co., 2005) A cup is illustrated among the images on p. 142, but without attribution.
Sellers, Charles Coleman, Benjamin Franklin in Portraiture (New Haven: Yale University, 1962) . Sellers illustrates not this set but another, similar but not identical, owned at the time of his writing (1962) by Mrs. Herbert May.
Bequest (by exchange) of George D. Widener, 1998. The V&A's cup came to them in 1919 as part of the J. G. Joicey Bequest.