Sari Siregar MI, Fitriani, Dahnial I. APPLICATION OF THE PROBLEM-BASED LEARNING MODEL IN PKN SUBJECTS ON CRITICAL THINKING ABILITY OF CLASS IV STUDENTS (SD PRIVATE AL-ULUM MEDAN). IJoSE [Internet]. 2023 Jun. 20 [cited 2025 Aug. 20];2(1):71-6. Available from: https://journal.berpusi.co.id/index.php/IJoSE/article/view/267