Karawa S, Thinwiangthong S. The Students’ Problem Posing Process in classroom by Using Lesson Study and Open Approach. dhammathas [internet]. 2021 Dec. 29 [cited 2026 Sep. 10];21(4):81-92. available from: https://so06.tci-thaijo.org/index.php/dhammathas/article/view/250825