Ervina, Ayu, Yusuf Suharto, and Ratna Rahmawati. “Penerapan Model Problem Based Learning Untuk Meningkatkan Kemampuan Berpikir Kritis Siswa Kelas X”. Journal of Geographical Sciences and Education 1, no. 2 (December 1, 2023): 64–78. Accessed June 23, 2026. https://journal.pubsains.com/index.php/jgs/article/view/60.