A series of portraits, works and photographic objects in Picasso's studio, 1937 - Photograph Pablo Picasso in front of Guernica
London, 7 October 1938 - Personal correspondence Roland Penrose's postcard to Pablo Picasso and Dora Maar
Paris, 5 November 1947 - Personal correspondence Daniel-Henry Kahnweiler's letter to Pablo Picasso, dated 5 November 1947