CALVO CALVO, Ángel. Telefonica takes command. Private monopoly, automatization and expansion of the telephone in Spain, 1924-1945. Revista de Historia Industrial — Industrial History Review, [S. l.], v. 15, n. 32, p. 69–98, 2017. DOI: 10.1344/rhi.v15i32.19677. Disponível em: https://revistes.ub.edu/index.php/HistoriaIndustrial/article/view/19677. Acesso em: 3 may. 2024.