Fadhilah, Yalvema Miaz, Yanti Fitria, and Zelhendri Zen. 2023. “Problem-Based Learning Model and Motivation on Students’ Critical Thinking Ability in Natural and Social Science Learning”. Indonesian Research Journal in Education |IRJE| 7 (2):502-17. https://doi.org/10.22437/irje.v7i2.31616.