Krisnamurti, Cyrenia Novella. “Efforts to Increase Student Activity and Learning Outcomes With Flat Building Materials Using the Problem-Based Learning (PBL) Learning Model”. Edumaspul: Jurnal Pendidikan 8, no. 1 (March 1, 2024). Accessed April 6, 2026. https://jurnal.unimen.cloud/index.php/maspuljr/article/view/7867.