Tusyahdiah, N. H., M. S. Djazilan, T. Retnawati, and Mega. “Peningkatan Hasil Belajar Matematika Materi Sudut Melalui Model Problem Based Learning Berbantuan Benda Konkret Siswa SD”. PROSIDING NATIONAL CONFERENCE FOR UMMAH, vol. 2, no. 1, June 2023, pp. 394-8, https://conferences.unusa.ac.id/index.php/NCU2020/article/view/1110.