Thoschuay, Rattasart. “A Study of Development Model of Open Approach Activities on the European Continent of Mathayomsuksa 2 Students”. Interdisciplinary Academic and Research Journal 2, no. 4 (August 13, 2022): 365–378. accessed September 11, 2026. https://so03.tci-thaijo.org/index.php/IARJ/article/view/262422.