Poonputta, Apantee, and Prasart Nuangchalerm. “A Model Framework for Enhancing Twenty-First Century Competencies in Primary School Teachers Within Northeastern Thailand’s Sub-Area”. International Journal of Learning, Teaching and Educational Research 23, no. 1 (January 30, 2024): 98–113. Accessed May 25, 2026. http://www.ijlter.net/index.php/ijlter/article/view/1835.