Madrid, 6 December 1968 - Institutional correspondence Luis Carrero Blanco's letter to Florentino Pérez Embid
New York, 4 May 1950 - Institutional correspondence Joseph Schwartz's letter to the Museum of Modern Art, New York
<em>Marxist Perspectives</em>, New York, vol. 1, no. 4 (winter, 1978): 28–51 - Article “The Museum of Modern Art as Late Capitalist Ritual: An Iconographic Analysis”