Purwatiningsih NLD, Wulandari IGAA. Portfolio Assessment Based Numbered Head Together toward Students’ Knowledge Competency of Mathematics. j. ilm. sekol. dasar [Internet]. 2020 Sep. 8 [cited 2024 Dec. 2];4(3):397-406. Available from: https://ejournal.undiksha.ac.id/index.php/JISD/article/view/25396