Suhirman, Suhirman, Yusuf Yusuf, Agus Muliadi, and Saiful Prayogi. “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, no. 06 (March 27, 2020): pp. 183–191. Accessed April 27, 2024. https://online-journals.org/index.php/i-jet/article/view/12061.