Mohamed, S. F. P., K. R. Ku-Mahamud, R. Ramli, and K. Abdullah. “Perception and Use of E-Mail: A Case Study in Universiti Utara Malaysia”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 2-12, Sept. 2017, pp. 29-35, https://jtec.utem.edu.my/jtec/article/view/2767.