PROBLEM-BASED LEARNING MODEL WITH A FLIPPED LEARNING APPROACH AND ITS EFFECT ON CRITICAL THINKING SKILLS OF AL MUHAFIZHOH HIGH SCHOOL STUDENTS, BLITAR CITY. JOSAR (Journal of Students Academic Research), [S. l.], v. 10, n. 1, p. 139–145, 2025. DOI: 10.35457/josar.v10i1.4300. Disponível em: https://ejournal.unisbablitar.ac.id/index.php/josar/article/view/4300. Acesso em: 31 jan. 2026.