Bonilla Freire, J., Chabusa Vargas , J., Tello Caicedo, G., & Cedeño Velasco, A. (2020). Marketing Challenges of Corporate Social Responsibility: Case Study of Mobile Telephone Operators in Ecuador. Revista Universidad De Guayaquil, 130(1), 39-52. https://doi.org/10.53591/rug.v130i1.1367