AdlinaM. N., RochyadiE., and SunardiS. “The Development of Syllable Method Through Sound Reposition to Improve Early Reading Skill Ability of Mild Mentally Retarded Class III at SLB C Dharma Bhakti Dharma Pertiwi Bandar Lampung”. International Conference on Elementary Education, Vol. 3, no. 1, Apr. 2021, pp. 611-6, http://proceedings.upi.edu/index.php/icee/article/view/1522.