Xaymoungkhoun, O., W. Bhuasiri, J. J. Rho, H. Zo, and M.-G. Kim. “The Critical Success Factors of e-Learning in Developing Countries”. Kasetsart Journal of Social Sciences, vol. 33, no. 2, Aug. 2012, pp. 321-32, https://so04.tci-thaijo.org/index.php/kjss/article/view/246821.