Krueboon, . K., P. Namnil, P. . Pangpongma, R. Sukkasem, N. Phetrak, and J. Phutiariyawat. “King Rama IX’s Wisdom to Develop the Skills of the 21st Century Learner”. Journal of Humanities and Social Sciences Nakhon Pathom Rajabhat University, vol. 11, no. 1, June 2021, pp. 45-58, https://so07.tci-thaijo.org/index.php/HUSO-J/article/view/1030.