William C. (William Chapin) Seitz. William Chapin Seitz letter to Alfred H. Barr, 1956 January 30. William C. Seitz papers, circa 1930-1995. Archives of American Art, Smithsonian Institution.
William C. (William Chapin) Seitz. William Chapin Seitz letter to the United States Educational Committee for France, 1957 April 16. William C. Seitz papers, circa 1930-1995. Archives of American Art, Smithsonian Institution.
Art Israel: 26 painters and sculptors, by William C. Seitz [associate curator] An exhibition organized by the Museum of Modern Art, under the joint auspices of the America-Israel Cultural Foundation, inc., and the International Council of the Museum of Modern Art
Hans Hofmann : mostra organizzata sotto gli auspici dell'International Council del Museum of Modern Art di New York, Torino, Galleria civica d'arte moderna, aprile 1965 / [catalogo a cura di William C. Seitz]