RAMADHANI, A. O.; NISA’, A. K.; ALIMATULHANA, N. .; RIZKY, M.; KUSUMAWATI, P. R. D. The Effect of the Problem-Based Learning (PBL) Model Combined with Laboratory Experiments on Students’ Level of Understanding of the Topic of Changes in the State of Matter in Elementary School. Primer Edukasi Journal, [S. l.], v. 6, n. 1, p. 80–87, 2026. DOI: 10.56406/jpe.v6i1.1137. Disponível em: https://jurnal-inais.id/index.php/JPE/article/view/1137. Acesso em: 12 sep. 2026.