Paris, 14 October 1955 - Institutional correspondence A letter from the Société de la Propriété Artistique et des Dessins et Modèles (S.P.A.D.E.M.) to the Musée des Arts Décoratifs
New York, 6 May 1955 - Institutional correspondence A letter from W.R. Keating & Company International to R. Lerondelle
New York, 23 January 1957 - Transport documents A letter from the vice-president of W. R. Keating & Company to Willem Sandberg
Artistic project, 7th Berlin Biennale for Contemporary Art, April 27 – July 1, 2012 - Website Occupy Biennale