Darim, Abu, Bambang Yulianto, Nuryadi Nuryadi, Lis Setyowati, Etty Widawati, and Kurniawati Kurniawati. “Overarticulator on Contoid [r] Indonesian Deaf Children”. Journal of Applied Science, Engineering, Technology, and Education 1, no. 2 (November 30, 2019): 105-113. Accessed May 7, 2021. https://jurnal.ahmar.id/index.php/asci/article/view/57.