ANALISIS KEVALIDAN DAN KEEFEKTIFAN MODUL AJAR BERBASIS PROBLEM BASED LEARNING (PBL) TERHADAP KEMAMPUAN PEMECAHAN MASALAH PADA MATERI SISTEM PERNAPASAN KELAS XI DI SMA NEGERI 1 NGABANG. Innovative Biology Education Journal (IBEJ), [S. l.], v. 1, n. 1, p. 9–19, 2025. Disponível em: https://jurnal.mipatek.upgripnk.ac.id/index.php/IBEJ/article/view/665. Acesso em: 15 mar. 2025.