Sumalpong, Aimee, and Amelia Buan. “The Learners’ Performance in an Open Contextualized Geometry Problems”. Asia Research Network Journal of Education 6, no. 2 (August 27, 2026): 130–138. accessed September 11, 2026. https://so05.tci-thaijo.org/index.php/arnje/article/view/277552.