Villareal F, A. P., A. F. . Aguirre A., C. A. . Collazos O., and R. . Gil I. “Emotional Approach of User-Centered Design for Virtual Learning Environments”. I+ T+ C- Research, Technology and Science - Unicomfacauca, vol. 1, no. 8, Dec. 2014, pp. 67-73, https://revistas.unicomfacauca.edu.co/ojs/index.php/itc/article/view/itc2014_67_73.