PÉREZ VARELA, Fidel. Los inicios la radio en Europa: 1921 – 1930 | The beginnings radio in Europe: 1921-1930. Razón y Palabra., [S. l.], v. 19, n. 2_90, p. 746–761, 2015. Disponível em: https://www.revistarazonypalabra.org/index.php/ryp/article/view/357. Acesso em: 25 jun. 2025.