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Firdauzia, Anisya Ayu Devinta (2019) Supplementary English reading and writing materials for eighth grade students assisted with mobile application. Skripsi thesis, Sanata Dharma University.
Firdauzia, Anisya Ayu Devinta (2016) Using direct written corrective feedback to improve eighth grade students` spelling accuracy in SMPN 15 Yogyakarta. Skripsi thesis, Sanata Dharma University.