Mapracha, K. ., T. . Hudcharoen, and P. . Chanfoy. “The Studying Mathematics Learning Achievement on Function by Using Self-Study Activity Packages of Grade 10 Room 7 Students Taweethapisek School”. Journal of Modern Learning Development, vol. 6, no. 5, June 2021, pp. 1-11, https://so06.tci-thaijo.org/index.php/jomld/article/view/249104.