Paris, 1 October 1955 - Institutional correspondence J. Malesset's letter to the Musee des Arts Décoratifs
Paris, 17 October 1955 - Institutional correspondence J. Malesset's letter to the Musée des Arts Décoratifs
Madrid, 23 and 25 September 1980 - Institutional correspondence Alejandro de Muns' letter to Javier Tusell, with reply