PENERAPAN MODEL PEMBELAJARAN BERBASIS MASALAH PBL PADA MATA PELAJARAN GEOGRAFI DI SMAN 1 LANGOWAN. GEOGRAPHIA : Jurnal Pendidikan dan Penelitian Geografi, [S. l.], v. 2, n. 2, p. 131 136, 2021. DOI: 10.53682/gjppg.v2i2.1207. Disponível em: https://ejurnal.unima.ac.id/index.php/geographia/article/view/1207. Acesso em: 19 dec. 2025.