Ahmed, A. R. S. (1998). ESL learners' usage of grammatical morphemes: The case of IIUM students. Kulliyyah of Islamic Revealed Knowledge and Human Science, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ahmed, Abdel Rahman Salih. ESL Learners' Usage of Grammatical Morphemes: The Case of IIUM Students. Kuala Lumpur: Kulliyyah of Islamic Revealed Knowledge and Human Science, International Islamic University Malaysia, 1998.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ahmed, Abdel Rahman Salih. ESL Learners' Usage of Grammatical Morphemes: The Case of IIUM Students. Kulliyyah of Islamic Revealed Knowledge and Human Science, International Islamic University Malaysia, 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.