Chomnawang, Y. “The Effects of Online Learning With ClassStart Platform for Developing Self-Directed-Learning of Undergraduate Students”. Journal of Education Rajabhat Maha Sarakham University, vol. 18, no. 1, Feb. 2021, pp. 95-104, https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/251566.