Al-Harbi, M. M., & Al-Eid, S. (2015). The Acquisition of the Present Perfect Tense in English by L2 Arabic Speakers. Al-Imam Muhammad Ibn Saud Islamic University, College of Languages and Translation, Department of English Language and Literature.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Al-Harbi, Manar M., و Saleh Al-Eid. The Acquisition of the Present Perfect Tense in English by L2 Arabic Speakers. Riyadh: Al-Imam Muhammad Ibn Saud Islamic University, College of Languages and Translation, Department of English Language and Literature, 2015.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Al-Harbi, Manar M., و Saleh Al-Eid. The Acquisition of the Present Perfect Tense in English by L2 Arabic Speakers. Al-Imam Muhammad Ibn Saud Islamic University, College of Languages and Translation, Department of English Language and Literature, 2015.