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Wijayanti, Shelfi Apri and , Prof. Dr. Endang Fauziati, M. Hum.. and , Dra. Dwi Haryanti, M. Hum. (2013) Vulnerability Of Interlanguage System: A Case Study Of Students Learning English As A Foreign Language In SMP Muhammadiyah 1 Surakarta. Skripsi thesis, Universitas Muhammadiyah Surakarta.