Nugraha, Markus Asta Patma, Jehosua S.V. Sinolungan, Rezeki Nur, Siti Nuridah, Nofirman Nofirman, and Didik Cahyono. “Conceptual Analysis of Problem-Based Learning Model in Improving Students Critical Thinking Skill”. Journal of Education Research 4, no. 2 (April 30, 2023): 466–473. Accessed October 9, 2025. https://www.jer.or.id/index.php/jer/article/view/185.