Rattanosot, P., S. Hajisalah, K. Piasai, A. Janjaroon, and K. Panichakarn. “A STUDY OF MATHEMATICAL PROBLEM-SOLVING ABILITIES ON DIFFERENTIAL EQUATIONS BY USING A LEARNING MANAGEMENT OF KWDL TECHNIQUE FOR UNDERGRADUATE MATHEMATICS MAJOR STUDENTS”. Journal of Industrial Education, vol. 18, no. 3, Nov. 2019, pp. 125-34, https://ph01.tci-thaijo.org/index.php/JIE/article/view/202791.