1.
Harahap A. Improving Students’ Conceptual Understanding through Problem Based Learning Model at SMP Negeri 3 Rao Selatan. IJESH [Internet]. 2024 Sep. 30 [cited 2025 Mar. 10];1(3):30-6. Available from: https://journal.mgedukasia.or.id/index.php/ijesh/article/view/251