Hamad، M. S.، و Yassin، A. A. (2015). Investigating Lexical Errors And Their Effect On University Students’ Written Performance In Sudan. مجلة العلوم الإنسانية، مج16, ع1 ، 1 - 18. مسترجع من http://search.mandumah.com/Record/641462
Hamad، Mohamed Satti، و Abd Allah Yassin. "Investigating Lexical Errors And Their Effect On University Students’ Written Performance In Sudan." مجلة العلوم الإنسانية مج16, ع1 (2015): 1 - 18. مسترجع من http://search.mandumah.com/Record/641462