Amsterdam and Brussels, 1956 - Exhibition catalogue Guernica: avec 60 études et variantesGuernica: met 60 studies et varianten
Paris, 28 March 1939 - Personal correspondence Pablo Picasso's letter to Roland Penrose, dated 28 March 1939
New York, 1939 - Exhibition catalogue Catalogue of the exhibition organised by the American Artists' Congress at the Valentine Gallery, for the benefit of Spanish refugees. Signed by Juan Negrín and Julio Álvarez del Vayo