Mubarok HW, Muslim A. EFFORTS TO IMPROVE LEARNING ACHIEVEMENT AND COLLABORATION USING A PROBLEM BASED LEARNING MODEL ON BUILDING SPACE MATERIAL IN CLASS IV. Proceeding Internasional Conference on Child Education [Internet]. 2023 Jul. 22 [cited 2025 Jul. 31];1(1):30-9. Available from: https://proceeding.unimar.ac.id/index.php/icce/article/view/4