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Maryana ., Lestari Kelik and , Prof. Dr. Endang Fauziati, M. Hum.. and , Drs. Djoko Srijono, M. Hum. (2013) Permeability Of Interlanguage System: A Case Study Of Students Learning English As A Foreign Language In SMP Muhammadiyah 5 Surakarta. Skripsi thesis, Universitas Muhammadiyah Surakarta.