Komal, Autchareya, and Parichart Prasertsang. “The Development of Mathematics Learning Activities Using SSCS Model for Grade 9 Students”. Journal of Roi Et Rajabhat University 15, no. 1 (April 28, 2021): 198-208. Accessed June 13, 2021. https://so03.tci-thaijo.org/index.php/reru/article/view/239535.