New York, 7 March 1956 - Institutional correspondence A telegram from Edgar Craig Schenk to Pablo Picasso
20 February 1980 - Institutional correspondence A letter from Ricardo de la Cierva Hoces to Adolfo Suárez
Madrid, 28 June 1980 - Institutional correspondence Ricardo de la Cierva Hoces' letter to Javier Tusell
<em>St. Louis Post-Dispatch</em>, Saint-Louis, November 13, 1969, front page and inside pages - Article “Lieutenant Accused of Murdering 109 Civilians”