Analisis Kevalidan Modul IPA Berbasis Problem Based Learning. Science and Physics Education Journal (SPEJ), [S. l.], v. 7, n. 1, p. 20–31, 2024. DOI: 10.31539/spej.v7i1.8611. Disponível em: http://www.journal.ipm2kpe.or.id/index.php/SPEJ/article/view/8611. Acesso em: 12 jun. 2026.