Arifah, Nurhabibi, Sofia NA. Improving Concept Understanding with Problem-Based Learning: Action Research at State Elementary School 106218 Pematang Toba. JIPS [Internet]. 2024 Dec. 31 [cited 2025 Mar. 9];1(4):33-42. Available from: https://journal.mgedukasia.or.id/index.php/jips/article/view/222