FEBRIANA ASTUTI, N. P.; PUTRA, M.; WIARTA, I. W. Pengaruh Model Problem Based Learning Berbasis Portofolio terhadap Hasil Belajar PKN. Jurnal Ilmiah Pendidikan dan Pembelajaran, [S. l.], v. 3, n. 2, p. 172–180, 2019. DOI: 10.23887/jipp.v3i2.18074. Disponível em: https://ejournal.undiksha.ac.id/index.php/JIPP/article/view/18074. Acesso em: 2 may. 2024.