Nambuddee, Nattida, Narumon Changsri, and Maitree Inprasitha. 2019. “Teachers’ Interpretation of Mathematics Textbook by Using Lesson Study and Open Approach”. KKU Research Journal (Graduate Studies) Humanities and Social Sciences 7 (2):23-35. https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/206622.