Hakim U, Syamsurianti S, Zaini SHB, Bahri A, Suardi S. Enhancing Student Engagement, Academic Performance, and Character through Problem- and Project-Based Learning: A Cross-National Study. IJLTER [Internet]. 2025 Sep. 30 [cited 2026 Mar. 7];24(9):20-39. Available from: https://ijlter.myres.net/index.php/ijlter/article/view/2482