Tharachan, K., W. Pimpasalee, W. yonwilad, and W. Rungkarach. “Development of mathematical solving problem skill in linear equation with two Variables using KWDL technique of Mattayomsuksa 3 Students”. Journal of Science and Science Education (JSSE), vol. 3, no. 2, June 2020, pp. 134-42, https://so04.tci-thaijo.org/index.php/JSSE/article/view/240840.