Suntornwat, J. ., and P. . Worrachat. “Developing Program of Promoting Teacher’s Competency in Mathematics Learning Management of Schools in Mahasarakham Primary Educational Service Area 1”. Journal of Roi Et Rajabhat University, vol. 14, no. 3, Dec. 2020, pp. 54-63, https://so03.tci-thaijo.org/index.php/reru/article/view/209354.