Jaisook, Supaporn, Somyot Chitmongkol, and Sumlee Thongthew. “A Mathematics Instructional Model by Integrating Problem-Based Learning and Collaborative Learning Approaches”. Humanities, Arts and Social Sciences Studies 13, no. 2 (November 21, 2013): 271–294. accessed September 10, 2026. https://so02.tci-thaijo.org/index.php/hasss/article/view/14507.