Madrid, 13 June 1981 - Institutional correspondence A letter from Álvaro González de Mesa to Javier Tusell
Artistic project, 7th Berlin Biennale for Contemporary Art, April 27 – July 1, 2012 - Website Occupy Biennale
New York, 15 February 1967 - Management of reproduction rights Pearl L. Moeller's letter to Dorothy C. Miller