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, [S. l.], v. 31, n. 5, 2022. DOI: 10.3145/epi.2022.sep.21. Disponível em: https://revista.profesionaldelainformacion.com/index.php/EPI/article/view/86896. Acesso em: 20 mar. 2026.