P. D. K. (Hengsawang), V. Thongdee, and S. Namseethan, “The Development of a Learning Activity Package on the Analysis of Key Issues in Thai History Using Problem-Based Learning (PBL) for Matthayom Suksa 4 Students at Wat Sriwichai Wanaram School, Loei Province”, jg-mcukk, vol. 13, no. 2, pp. 82–96, Jun. 2026.