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Syahrullah, Asep Shofian and , Prof. Dr. Endang Fauziati, M.Hum. and , Phil. Dr. Dewi Chandraningrum, M.A. (2015) Permeability Of Interlanguage System: A Case Study Of Interlanguage System Of Junior High School Students Of SMP N 2 Surakarta Learning English As A Foreign Language. Thesis thesis, Universitas Muhammadiyah Surakarta.