WIDYASTUTIK, IIN. PENERAPAN MODEL PROBLEM BASED INSTRUCTION (PBI) PADA TEMA PENCEMARAN AIR UNTUK MELATIH KETERAMPILAN PENYELESAIAN MASALAH. PENSA E-JURNAL: PENDIDIKAN SAINS, [S. l.], v. 2, n. 01, 2014. DOI: 10.26740/pensa.v2i01.6683. Disponível em: https://ejournal.unesa.ac.id/index.php/pensa/article/view/6683. Acesso em: 19 nov. 2025.