Al-Oqail, H. S., & Al-Ahaydib, M. (2013). A descriptive study on the causes behind pronunciation errors among Saudi intermediate school students in Riyadh. Al-Imam Mohammed Bin Saud Islamic University, College Languages and Translation, Department of English Language and Literature.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Al-Oqail, Hassah Saad, و Mohammed Al-Ahaydib. A Descriptive Study on the Causes Behind Pronunciation Errors Among Saudi Intermediate School Students in Riyadh. Riyadh: Al-Imam Mohammed Bin Saud Islamic University, College Languages and Translation, Department of English Language and Literature, 2013.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Al-Oqail, Hassah Saad, و Mohammed Al-Ahaydib. A Descriptive Study on the Causes Behind Pronunciation Errors Among Saudi Intermediate School Students in Riyadh. Al-Imam Mohammed Bin Saud Islamic University, College Languages and Translation, Department of English Language and Literature, 2013.