New York, 12 March 1956 - Institutional correspondence Bernard Karpel's letter to Willem Sandberg, dated 12 March 1956
New York, 27 November 1956 - Institutional correspondence Bernard Karpel's letter to Willem Sandberg, dated 27 November 1956
2004 - Photograph Maya Picasso and Diana Widmeyer Picasso contemplate the Guernica tapestry at Atelier Picasso, Paris