Jongjit, Nittaya, Anchalee Sangarwut, and Thanya Kadroon. “The Development of Mathematical Problems Solving on Two Variable Linear Equations System using Learning Activities of Polya’s Model Combined with Think-Pair-Share Technique for Matthayomsuksa 3 Chaiya Wittaya School Suratthani”. Journal of Graduate MCU KhonKaen Campus 12, no. 3 (September 30, 2025): 441–454. accessed September 1, 2026. https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/279272.