HIDAYATI, Siti; SUSILAWATI, Susilawati; HARJONO, Ahmad. Validity and Practicality of Problem Based Learning (PBL) Model Learning Tools to Improve Students’ Conceptual Understanding. Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram, [S. l.], v. 9, n. 1, p. 82–87, 2021. DOI: 10.33394/j-ps.v9i1.3966. Disponível em: https://e-journal3.undikma.ac.id/index.php/prismasains/article/view/3966. Acesso em: 16 aug. 2025.