วรพิน ก. Development of an Instructional Process Based on Authentic Learning and Systematic Thinking Approaches to Enhance the Mathematics Problem Solving Ability of Lower Secondary School Students. EDUCU [Internet]. 2019 Dec. 27 [cited 2024 May 6];47(4):1-21. Available from: https://so02.tci-thaijo.org/index.php/EDUCU/article/view/231752