Madrid, 24 September 1936 - Institutional correspondence Letter from Josep Renau to Pablo Picasso, 24 September 1936
Paris, 29 September 1945 - Institutional correspondence A letter from the secretary of the Association des Intellectuels italiens in France to Pablo Picasso
<em>The New York Times</em>, New York, September 28, 1969, section D, 35 - Article “Keeping Art On The Streets”