Hardiyanti Hasibuan, Siti, and Damri. 2020. “Efektifitas Permainan Tradisional Dalam Meningkatkan Kemampuan Penjumlahan Deret Ke Samping Bagi Siswa Tunarungu ”. Ranah Research : Journal of Multidisciplinary Research and Development 2 (2), 214-21. https://jurnal.ranahresearch.com/index.php/R2J/article/view/260.