Suryaman, Wiwik, and Fatmawati. 2020. “Meningkatkan Vokasional Membuat Opak Jengkol Bagi Siswa Tunarungu Menggunakan Direct Instruction Lerning Model”. Ranah Research : Journal of Multidisciplinary Research and Development 2 (2), 160-65. https://jurnal.ranahresearch.com/index.php/R2J/article/view/252.