Negara, I.P.A.S., Kristiantari, M.G.R. and Saputra, K.A. 2021. Model Problem Based Learning Meningkatkan Hasil Belajar IPA Siswa Kelas VI. Jurnal Ilmiah Pendidikan Profesi Guru. 4, 3 (Aug. 2021), 403–413. DOI:https://doi.org/10.23887/jippg.v4i3.38185.