Ngamwong, I., and A. Suikraduang. “The Development of Learning Activities Using Problem-Based Learning Techniques to Enhance Problem-Solving Ability and Civic Duties for Prathomsuksa 3 Students”. Journal for Developing the Social and Community, vol. 13, no. 2, July 2026, pp. 855-68, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/304094.