Sholihah, Khoirur Rohmaniatush, and Djono. “Integration of Gamification and the Problem-Based Learning (PBL) Model in Chemistry Learning to Improve Critical Thinking Skills: A Literature Review”. Indonesian Journal of Learning and Instructional Innovation 3, no. 02 (December 30, 2025): 148–156. Accessed April 2, 2026. https://journal.uns.ac.id/index.php/ijolii/article/view/3009.