Silvestre Rodríguez, J. “The Determinants of Labour Protest in Spain, 1905-1935: Economic Cycle, Political Framework and Union Organisation”. Revista De Historia Industrial — Industrial History Review, vol. 1, no. 24, July 2017, pp. 51-80, https://revistes.ub.edu/index.php/HistoriaIndustrial/article/view/19483.