FIRMANSAH. PENINGKATAN MOTIVASI BELAJAR SISWA MELALUI BERBASIS PROBLEM BASED LEARNING PADA MATERI PENCEMARAN AIR KELAS X DI SMA NEGERI 1 EMPANG. Jurnal Biologi Konstektual (JBK), [S. l.], v. 3, n. 2, p. 82–85, 2021. Disponível em: https://e-journal.unmas.ac.id/index.php/JBK/article/view/8072. Acesso em: 3 jul. 2024.