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A. Aprillia and D. Sidabalok, “A Study of Teaching Techniques Used By The Teachers of Speech Impaired Students and The Influences Towards Learning Achievements in Tenth and Eleventh Grade at SLB Dharma Bhakti Dharma Pertiwi in Academic Year 2017/2018”, JEES, vol. 2, no. 1, pp. 52-59, May 2019.