Pintong, Tarin, Rujika Booncherd, and Watcharee Waratchareeyakul. “Project-Based Learning in the 21st Century: A Systematic Review of Theoretical Foundations, Design Principles, and Learning Outcomes”. Journal of Education & Learning Development Innovation 5, no. 1 (June 29, 2026): 14–30. accessed September 17, 2026. https://so15.tci-thaijo.org/index.php/JELDI/article/view/3519.