Paris, 18 October 1948 - Institutional correspondence A letter from Mariano Miguel to José Ballester-Gozalvo
<em>Newsweek</em>, New York, March 10, 2015 - Article “Mark Lombardi's Art Was Full of Conspiracies — Now His Death Has Become One”
Mougins, 10 December 1970 - Personal correspondence A telegram Mariano Miguel, Picasso’s secretary, sent to Raimon Noguera to request the cancellation of the opening ceremony for the expansion of Museo Picasso