Hidayati, S., Susilawati, S. and Harjono, A. (2021) “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, 9(1), pp. 82–87. doi: 10.33394/j-ps.v9i1.3966.