Pandiangan, Saut Maruli Tua, Josua Alexander Gultom, Dian Ariani, Donny Dharmawan, and Ribka Sari Butar-Butar. “Effect of Problem-Based Learning Model on Learning Outcomes in Microeconomic Course”. Edumaspul: Jurnal Pendidikan 7, no. 2 (October 1, 2023): 5572-5575. Accessed November 21, 2024. https://ummaspul.e-journal.id/maspuljr/article/view/7283.