Fuangfoo, Phornpen, and Narumon Changsri. “STUDENTS’ MATHEMATICAL FLEXIBILITY THINKING IN MATHEMATICS CLASSROOM USING LESSON STUDY AND OPEN APPROACH”. Journal of MCU Nakhondhat 7, no. 12 (December 29, 2020): 41–56. Accessed April 20, 2024. https://so03.tci-thaijo.org/index.php/JMND/article/view/249094.