Khered، M. O. H.، و Guenther، J. E. (2005). MEASURING THE SYNTACTIC MATURITY IN THE WRITTEN ENGLISH OF ARAB STUDENTS AT FOUR PROFICIENCY LEVELS AND ESTABLISHING AN EFL INDEX OF DEVELOPMENT (رسالة دكتوراه غير منشورة). University of Kansas، لورانس. مسترجع من http://search.mandumah.com/Record/619719
Khered، Muhammad Omar Hasan، و John E. Guenther. "MEASURING THE SYNTACTIC MATURITY IN THE WRITTEN ENGLISH OF ARAB STUDENTS AT FOUR PROFICIENCY LEVELS AND ESTABLISHING AN EFL INDEX OF DEVELOPMENT" رسالة دكتوراه. University of Kansas، لورانس، 2005. مسترجع من http://search.mandumah.com/Record/619719