Al-Harbi, A. I., & Ahmed, R. (2009). Influence of EFL students' oral proficiency on their participation in class. Al-Imam Mohammad Ibn Saud Islamic University, College of Languages and Translation, Department of english Language and Literature.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Al-Harbi, Abeer Ibrahim, و Rafik Ahmed. Influence of EFL Students' Oral Proficiency on Their Participation in Class. Riyadh: Al-Imam Mohammad Ibn Saud Islamic University, College of Languages and Translation, Department of english Language and Literature, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Al-Harbi, Abeer Ibrahim, و Rafik Ahmed. Influence of EFL Students' Oral Proficiency on Their Participation in Class. Al-Imam Mohammad Ibn Saud Islamic University, College of Languages and Translation, Department of english Language and Literature, 2009.