Wahyuni, S. et al. 2023. Implementation of the Problem Based Learning Model to Increase the Activity and Learning Outcomes of Students in the Digestive System Material and the Human Respiratory System Class XI MAN 2 Tanah Datar. Jurnal Penelitian Pendidikan IPA. 9, 11 (Nov. 2023), 9263–9269. DOI:https://doi.org/10.29303/jppipa.v9i11.4537.