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
Taos (New Mexico), 2014 - Photograph Preparing the banner against the occupation of Gaza with a replica of Guernica
Oslo, 1938 - Exhibition catalogue Catalogue of the exhibition Henri Matisse, Picasso, G. Braque, Laurens at Kunstnernes Hus, Oslo