Sari, D. R.; Hasanah, D.; Rambe, A. K.; Mukra, M. Studi Literatur: Analisis Penerapan Model Pembelajaran Problem Based Learning Dalam Meningkatkan Kemampuan Berpikir Kritis Pada Materi Perncemaran Lingkungan Kelas X SMA Methodist Lubuk Pakam : (Literature Study: Analysis of the Application of the Problem Based Learning Model in Improving Critical Thinking Abilities on Environmental Pollution Material for Class X Lubuk Pakam Methodist High School) . Biodik 2024, 10, 111-120.