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Pertiwi, Dian Putri and , Hepy Adityarini, Ph. D (2019) An Error Analysis on The Use of Modal Auxiliary Made by English Education Students at Muhammadiyah University of Surakarta. Skripsi thesis, Universitas Muhammadiyah Surakarta.
Qoiril, Nunung Alfiah and , Hepy Adityarini, Ph. D (2018) A Study On Factors Affecting Students’ Speaking Performance At SMK Muhammadiyah 2 Klaten Utara. Skripsi thesis, Universitas Muhammadiyah Surakarta.