Shalbag، R. A.، و Mokadem، A. A. H. (2014). Investigating grammatical mistakes in liyan learners' written discourse in al mergeeb university. مجلة التربوي، ع4 ، 454 - 467. مسترجع من http://search.mandumah.com/Record/762525
Shalbag، Ramadan Ahmed، و Abd Alrahim Hamid Mokadem. "Investigating Grammatical Mistakes in Liyan Learners' Written Discourse in Al Mergeeb University." مجلة التربوي ع4 (2014): 454 - 467. مسترجع من http://search.mandumah.com/Record/762525