Khamma, Nattinee, and Patcharawalai Meesap. “A Study of the Need for Learning Management to Enhance Problem Solving Skills Mathematics of Teachers”. Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University 13, no. 2 (July 10, 2019): 590–603. Accessed April 20, 2024. https://so01.tci-thaijo.org/index.php/GraduatePSRU/article/view/185833.