Suryani Fitri, Efni, and Fatmawati. 2020. “Meningkatkan Kemampuan Mengenal Huruf Vokal Melalui Media Big Book Pada Anak Tunarungu Di Kelas II SLB N 1 KUBUNG”. Ranah Research : Journal of Multidisciplinary Research and Development 2 (4), 58-67. https://jurnal.ranahresearch.com/index.php/R2J/article/view/304.