Duangsong, Pichapa, Thardthong Pansuppawat, and Arunrat Khamhaengpol. 2022. “Development of Critical Thinking Abilities and Learning Achievement of Mathayomsuksa 1 Students Entitled Substances Around Us by Using Problem-Based Learning and Graphic Organizers”. Journal of Education Rajabhat Maha Sarakham University 19 (2). Bangkok, Thailand:165-77. https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/258624.