PURWATININGSIH, N. L. D.; WULANDARI, I. G. A. A. Portfolio Assessment Based Numbered Head Together toward Students’ Knowledge Competency of Mathematics. Jurnal Ilmiah Sekolah Dasar, [S. l.], v. 4, n. 3, p. 397–406, 2020. DOI: 10.23887/jisd.v4i3.25396. Disponível em: https://ejournal.undiksha.ac.id/index.php/JISD/article/view/25396. Acesso em: 17 jul. 2024.