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Perdana, Hestuningtyas Maharani and , Agus Wijayanto, Ph.D and , Mauly Halwat Hikmat, Ph. D (2017) The Students’ Comprehension On Politeness/ Impoliteness In Interlanguage Pragmatics Of Complaints By Efl Learners In Ums. Thesis thesis, Universitas Muhammadiyah Surakarta.
Perdana, Hestuningtyas Maharani and , Prof. Dr. Endang Fauziati, M. Hum and , Nur Hidayat, S. Pd, M. Pd (2015) Comparative Error Analysis In Writing Recount Text Made By The First And The Third Semester Students Of English Department UMS 2014/2015 Academic Year. Skripsi thesis, Universitas Muhammadiyah Surakarta.
