“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) 10, no. 1 (May 11, 2025): 139–145. Accessed January 31, 2026. https://ejournal.unisbablitar.ac.id/index.php/josar/article/view/4300.