Nambuddee, N., N. Changsri, and M. Inprasitha. “Teachers’ Interpretation of Mathematics Textbook by Using Lesson Study and Open Approach”. KKU Research Journal (Graduate Studies) Humanities and Social Sciences, vol. 7, no. 2, July 2019, pp. 23-35, https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/206622.