“PENINGKATAN PRESTASI BELAJAR MATEMATIKA MATERI PERKALIAN MELALUI MEDIA ABAKUS BAGI SISWA TUNANETRA ”. Jurnal Orthopaedagogia 1, no. 01 (February 4, 2013): 27–35. Accessed October 30, 2024. https://journal.uns.ac.id/index.php/orthopaedagogia/article/view/1167.