Ormond, Richard and Elaine Kilmurray, "John Singer Sargent: complete paintings; volume 3, The later portraits," New Haven, CT: Yale University Press, 2003, no. 479.
Hoopes, Donelson F., "The Private World of John Singer Sargent," New York: Shorewood, (Corcoran Gallery of Art), 1964.
McKibbin, David, "Sargent's Boston," Boston, Museum of Fine Arts, 1956.
Summary:
Sketch of Ena Wertheimer (1874-1935) and Antonio Mancini (1852-1930).