Paris, 5 May 1955 - Institutional correspondence A letter from the general secretary of Les Arts Décoratifs to the insurance company L'Union
Paris, 15 November 1955 - Institutional correspondence A letter from the general secretary of the Musée des Arts Décoratifs to the Société de la Propriété Artistique et des Dessins et Modèles (S.P.A.D.E.M.)
Paris, 17 October 1955 - Internal museum documents A note from the general secretary of the Union Centrale des Arts Décoratifs
Paris, 3 August 1956 - Institutional correspondence A letter from the general secretary of Les Arts Décoratifs to the Haus der Kuns, Munich
Ellen C. Oppler (ed.), <em>Picasso’s Guernica</em>, New York and London: W. W. Norton & Company, 1988, 236–238 - Essay “How Effective Is Social Protest Art? (Vietnam)”
Siracusa, New York, 15 July 1979 - Institutional correspondence Ellen Oppler's letter to Luisa Kreisberg