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
glottolog.org
Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin biên tập (2013). “Provençal”. Glottolog. Leipzig: Max Planck Institute for Evolutionary Anthropology.