กุมภิโร พ, กำจัดภัย ส, ชำนาญกิจ พ. Development of an Enrichment Curriculum According to the Concepts of Context-based Learning through the Use of Problem-based Learning for Enhancing Mathematical Skills and Processes for Sixth Grade Students. Pitchayatat [Internet]. 2018 Dec. 28 [cited 2024 May 19];13(2):127-35. Available from: https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/221641