Shamdas, Gamar B. N., et al. “The Influence of the Problem-Based Learning Model on Metacognitive Knowledge and Science Learning Outcomes”. Jurnal Penelitian Pendidikan IPA, vol. 10, no. 3, Mar. 2024, pp. 1383-95, https://jppipa.unram.ac.id/index.php/jppipa/article/view/5444.