Gasim, G. A. M. (1999). Political legitimacy: A comparative study with special reference to the legitimacy crisis during the Umayyads. International Institute of Islamic Thought and Civilization (ISTAC).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gasim, Gamal Ali Mohammed. Political Legitimacy: A Comparative Study with Special Reference to the Legitimacy Crisis During the Umayyads. Kuala Lumpur: International Institute of Islamic Thought and Civilization (ISTAC), 1999.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Gasim, Gamal Ali Mohammed. Political Legitimacy: A Comparative Study with Special Reference to the Legitimacy Crisis During the Umayyads. International Institute of Islamic Thought and Civilization (ISTAC), 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.