Talason, Polpisit, and Kanyarat Cojorn. 2019. “The Development of Problem-Solving Ability and Learning Achievement in Chemistry Subject of Mathayomsuksa 6 Students”. Journal of Roi Et Rajabhat University 13 (1), 3-15. https://www.tci-thaijo.org/index.php/reru/article/view/185874.