Suwannakam, Chanakan, and Narumon Changsri. 2021. “ASSESSING STUDENTS’ THINKING SKILLS IN MATHEMATICS CLASSROOM USING LESSON STUDY AND OPEN APPROACH”. Journal of MCU Nakhondhat 8 (4). Nakhon Si Thammarat, Thailand:90-102. https://so03.tci-thaijo.org/index.php/JMND/article/view/251626.