Duangsong, P., Pansuppawat, T. and Khamhaengpol, A. 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 (Aug. 2022), 165–177.