"Langues régionales". Ministère de la culture (France). Retrieved 13 February 2023.
degruyter.com
On the persistent use of Provençal as a synonym of Occitan see: Constanze WETH. « L'occitan / provençal ». Manuel des langues romanes, Edited by Klump, Andre / Kramer, Johannes / Willems, Aline. DE GRUYTER. 2014. Pages: 491–509. ISBN (Online): 9783110302585