López-Losa, Ernesto. “The Spanish Economic Backwardness in the European Mirror (1813-1914)”. Revista de Historia Industrial — Industrial History Review 19, no. 43 (December 14, 2017): 15–64. Accessed January 23, 2025. https://revistes.ub.edu/index.php/HistoriaIndustrial/article/view/20709.