Philadelphia, 18 September 1957 - Institutional correspondence Henry Clifford's letter to Pablo Picasso
Madrid, 7 and 19 January 1981 - Institutional correspondence A letter from Enrique Calduch to Javier Tusell
Philadelphia, 1958 - Exhibition catalogue Catalogue for the exhibition Picasso: 75th Anniversary at the Philadelphia Museum of Art
Jeanne Siegel (ed.), <em>Artwords: Discourse on the ‘60s and ‘70s</em>, Ann Arbor: UMI Research Press, 1985, 101-119 - Essay “How Effective Is Social Protest Art? (Vietnam)”