Al-Asum, A. H. (1978). public transport in the three towns. Universiy of Khartoum Faculty of Arts, Department of Geography.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Al-Asum, Abdel Hafiz. Public Transport in the Three Towns. Khartoum: Universiy of Khartoum Faculty of Arts, Department of Geography, 1978.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Al-Asum, Abdel Hafiz. Public Transport in the Three Towns. Universiy of Khartoum Faculty of Arts, Department of Geography, 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.