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Barokah, Nurhayati Tangga and , Drs. Djoko Srijono, M.Hum. (2020) The Students’ Difficulties In Pronouncing The English Vowels At The Seventh Grade Of SMPN 2 Simo In 2017/2018 Academic Year. Skripsi thesis, Universitas Muhammadiyah Surakarta.