Harahap, A. (2024) “Improving Students’ Conceptual Understanding through Problem Based Learning Model at SMP Negeri 3 Rao Selatan”, Indonesian Journal of Education and Social Humanities, 1(3), pp. 30–36. Available at: https://journal.mgedukasia.or.id/index.php/ijesh/article/view/251 (Accessed: 10 March 2025).