Sukgunya, Sompit, and Titiworada Polyiem. 2021. “The Development of a Problem Based Learning Management Teacher Development Program for Schools under the Office of the Secondary Educational Service Area 28”. Academic Journal of Mahamakut Buddhist University Roi Et Campus 10 (2):ึ720-732. https://so01.tci-thaijo.org/index.php/AJMBU/article/view/246588.