“Optimalisasi Problem Based Learning Melalui Media Flipbook Digital Untuk Mengakselerasi Kemampuan Berpikir Kritis Pelajaran IPS”. Journal of Instructional and Development Researches 6, no. 2 (April 30, 2026): 165–176. Accessed October 29, 2026. https://www.journal.iel-education.org/index.php/JIDeR/article/view/734.