Abdullah, K. A. S. (2005). The Usage of internet by the academic staff of the faculty of arts, Aden University and Sana'a University, Yemen: A comparative study. Kulliyyah of Information And Communication Technology, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Abdullah, Khaled Ateik Saeed. The Usage of Internet by the Academic Staff of the Faculty of Arts, Aden University and Sana'a University, Yemen: A Comparative Study. Gombak, Selangor: Kulliyyah of Information And Communication Technology, International Islamic University Malaysia, 2005.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Abdullah, Khaled Ateik Saeed. The Usage of Internet by the Academic Staff of the Faculty of Arts, Aden University and Sana'a University, Yemen: A Comparative Study. Kulliyyah of Information And Communication Technology, International Islamic University Malaysia, 2005.