A. P. D. C. Chookhampaeng and K. Chadong, “Professional Learning community applying in Cooperative Learning to Enhance Working Group Process of Mathayomsueksa 1 Thakhonyang Pittayakom School Maha Sarakham Province”, JRDI. RMU, vol. 5, no. 2, pp. 13–24, Dec. 2018.