Marketing Challenges of Corporate Social Responsibility: Case Study of Mobile Telephone Operators in Ecuador. Revista Universidad de Guayaquil, [S. l.], v. 130, n. 1, p. 39–52, 2020. DOI: 10.53591/rug.v130i1.1367. Disponível em: https://revistas.ug.edu.ec/index.php/rug/article/view/162. Acesso em: 5 dec. 2025.