Chanmarlee, B., พานทอง ก. and Pradujprom, P. (2024) “Enhancing Math Problem Solving Skills and Working Memory of Grade 3 Students using a Problem-based Learning Method Together with the Application of Abstract Code Model”, Journal of MCU Phetchaburi Review , 7(1), pp. หน้า 486 – 503. available at: https://so03.tci-thaijo.org/index.php/JPR/article/view/275275 (accessed: 14 September 2026).