2 March 1974 - Institutional correspondence A letter from Karl Denim, S. S. Kush and Joshua Jericho in defence of Tony Shafrazi
Paris, 2 November 1979 - Personal correspondence A copy of a letter Claude Picasso wrote to William Rubin, director of Painting and Sculpture at MoMA
<em>The Museum of Modern Art at Mid Century, At Home and Abroad; Studies in Modern Art 4</em>, New York: MoMA, 1994, 38–55 - Article “Revisiting the Revisionists: the Modern, its Critics, and the Cold War”
Paris, 1 March 1975 - Personal correspondence Claude Picasso's letter to William S. Lieberman, dated 1 March 1975