Paris, 10 December 1975 - Institutional correspondence Miguel de Lojendio's letter to Spain's Ministry of Culture
New York, 24 October 1945 - Institutional correspondence A letter from Curt Valentin to Roland Penrose
<em>Ramparts</em>, San Diego, vol. 5, no. 7 (January 1967): 44–68 - Article “The Children of Vietnam”