21 May 1976 - Personal correspondence Letter from Tomàs Llorens to Claude Picasso within the context of the Venice Biennale
New York, 4 May 1950 - Institutional correspondence Joseph Schwartz's letter to the Museum of Modern Art, New York
<em>Frieze</em>, London, no. 104 (January–February 2007), January 1, 2007 - Article “2nd Seville Biennial”