Dokcom, Urai, and Dr. Savitree Thaoto. 2020. “The Development of science learning activities by stem education of our local soil to promote the ability to solve problems for prathomsuksa 2 students”. Ubon Ratchathani Journal of Research and Evaluation 9 (1):63-73. https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/224110.