Zamsari, Putri, and Asmin. “Effect of Problem Based Learning Model on Ability Imelda Medan Private Middle School Student Problem Solving”. Formosa Journal of Applied Sciences 1, no. 6 (November 30, 2022): 1267–1294. Accessed May 12, 2026. https://journal.formosapublisher.org/index.php/fjas/article/view/1942.