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
Paris, 30 October 1971 - Institutional correspondence A letter from Luis López Ballesteros to Alfredo Sánchez Bella