García-Marín, David. “The Radio on Paper. Precedents of Transmedia Storytelling in Unión Radio and Ondas Magazine (1925-1935)”. Historia y Comunicación Social 28, no. 1 (May 30, 2023): 133–146. Accessed July 11, 2026. https://revistas.ucm.es/index.php/HICS/article/view/83895.