São Paulo, 28 December 1953 - Institutional correspondence Francisco Matarazzo Sobrinho's letter to Daniel-Henry Kahnweiler
São Paulo, 14 February 1954 - Institutional correspondence Francisco Matarazzo Sobrinho's letter to Pablo Picasso, dated 14 February 1954
São Paulo, 4 February 1954 - Institutional correspondence Francisco Matarazzo Sobrinho's letter to Pablo Picasso, dated 4 February 1954
São Paulo, 26 December 1952 - Institutional correspondence Francisco Matarazzo Sobrinho's letter to Pablo Picasso, dated 26 December 1952
<em>The New York Times</em>, New York, June 13, 1971, 1 - Article “Vietnam Archive: Pentagon Study Traces 3 Decades of Growing U.S. Involvement”