Sudsaneiha, Atisak, Thipwimol Wangkaeohiran, and Pornthip Ankasem. “A Study of Academic Achievement Based on Mathematical Process by a Learning Activitiy Package According to the Active Learning Concept for Prathomsuksa 4 Students”. Journal of Graduate Research 11, no. 2 (December 1, 2020): 123-136. Accessed May 14, 2021. https://so02.tci-thaijo.org/index.php/banditvijai/article/view/241132.