Madrid, 30 March 1988 - Internal institutional documents A letter from the director-general of Fine Arts to the Cabinet of Spain's Ministry of Culture
New York, 8 May 1968 - Institutional correspondence Antonio Serrano's letter to Fernando María Castiella
Madrid, 14 September 1981 - Institutional correspondence Official notice from the Management Board of Fine Arts, Archives and Museums to José Manuel Pita Andrade
<em>Newsweek</em>, New York, March 10, 2015 - Article “Mark Lombardi's Art Was Full of Conspiracies — Now His Death Has Become One”