PÉREZ CASTROVIEJO, P. M. Purchasing power and living quality of the Biscayan workers, 1876-1936. Revista de Historia Industrial — Industrial History Review, [S. l.], v. 15, n. 30, p. 103–142, 2017. Disponível em: https://revistes.ub.edu/index.php/HistoriaIndustrial/article/view/19621. Acesso em: 2 feb. 2025.