New York, 16 October 1981 - Institutional correspondence John Koegel's letter to Javier Tusell, dated 16 October 1981
New York, 16 October 1981 - Institutional correspondence John Koegel's letter to Javier Tusell, dated 16 October 1981
New York, 16 October 1981 - Institutional correspondence John Koegel's letter to Javier Tusell, dated 16 October 1981
30 October 1981 - Institutional correspondence John Koegel's letter to Richard E. Oldenburg, dated 30 October 1981
10 September 1981 - Internal museum documents Registration sheet for the Picasso works deposited at the Casón, including Guernica
Madrid, January 1982 - Leaflet Didactic leaflet Sección de Arte Siglo XIX, Legado Picasso, Guernica, made by Gabinete Didáctico
1988-1992 - Internal museum documents Arranging the Collection: The transfer of Pablo Picasso's Guernica to the Centro de Arte Reina Sofía
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)”
New York, 31 August 1981 - Institutional correspondence John Koegel's letter to Richard E. Oldenburg, dated 31 August 1981
Siracusa, New York, 15 July 1979 - Institutional correspondence Ellen Oppler's letter to Luisa Kreisberg