Bataluna, G., Medina, J., Luib, J. R., Sombilon, V. and Malicoban, E. (2021) “Development of Problem-Solving Approach Lesson Plans in Geometry”, Asia Research Network Journal of Education, 1(3), pp. 121–135. available at: https://so05.tci-thaijo.org/index.php/arnje/article/view/253773 (accessed: 29 September 2026).