Kobkhuntod, Jirawan, Preeyaphorn Jainim, and Phenphanor Phungphae. 2023. “DEVELOPMENT OF SOCIAL STUDIES TEACHING IN THE 21st CENTURY USING PROBLEM-BASED”. PNRU Academic Journal 2 (1):36-46. https://so07.tci-thaijo.org/index.php/PNRU_ACA/article/view/1949.