Suhirman, Suhirman, Yusuf Yusuf, Agus Muliadi, and Saiful Prayogi. 2020. “The Effect of Problem-Based Learning With Character Emphasis Toward Students’ Higher-Order Thinking Skills and Characters”. International Journal of Emerging Technologies in Learning (iJET) 15 (06):pp. 183-191. https://doi.org/10.3991/ijet.v15i06.12061.