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
San Sebastián, 2016 - Exhibition catalogue Catalogue for the exhibition 1937: On Guernica, War and Civitas at the Museo de Bellas Artes, Bilbao
Exhibition, Museo Nacional Centro de Arte Reina Sofía, Madrid, January 21 – May 4, 2015 - Exhibition Daniel G. Andújar, Operating System
New York, 31 August 1981 - Institutional correspondence John Koegel's letter to Richard E. Oldenburg, dated 31 August 1981