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 [Internet]. 2025 May 11 [cited 2025 Dec. 16];10(1):139-45. Available from: https://ejournal.unisbablitar.ac.id/index.php/josar/article/view/4300