Rustam Hasibuan. Implementation of Problem Based Learning Model to Improve Student Learning Outcomes State Elementary School 0703 Hutaraja Tinggi, Hutaraja Tinggi District, Padang Lawas Regency. IJIE [Internet]. 2025 Mar. 15 [cited 2026 Feb. 9];1(1):189-94. Available from: https://journal.maalahliyah.sch.id/index.php/ijie/article/view/194