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
The New Yorker, 31 January 2022 - Drawing Modern Life. The New Yorker cover that pays hommage to MoMA