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
Amsterdam and Brussels, 1956 - Exhibition catalogue Guernica: avec 60 études et variantesGuernica: met 60 studies et varianten
1956 - Conferences and articles Text by Emil Langui for the exhibition catalogue Guernica, avec 60 études
Brussels, 19 July 1957 - Institutional correspondence A letter from Émile Langui to Pablo Picasso, 19 July 1957
Brussels, 19 July 1957 - Institutional correspondence Émile Langui's letter to Pablo Picasso, dated 19 July 1957
Brussels, 6 September 1957 - Institutional correspondence Émile Langui's letter to Pablo Picasso, dated 6 September 1957
São Paulo, 26 December 1952 - Institutional correspondence Francisco Matarazzo Sobrinho's letter to Pablo Picasso, dated 26 December 1952