Barrio-Fraile, E., Enrique-Jiménez, A.-M., Fajula-Payet, A., Barbeito-Veloso, M.-L. y Perona-Páez, J.-J. 2022. The sound of responsibility: evolution of the use of radio advertising as a corporate social responsibility (CSR) communication channel before and after Covid-19. A significant increase. Profesional de la información. 31, 5 (oct. 2022). DOI:https://doi.org/10.3145/epi.2022.sep.21.