Boayo, S. M. H. (2006). The role of morality akhlaq in the rise and decline of civilizations: Aspects of the Muslim intepretation of Roman Civilization's decline. International Institute of Islamic Thought and Civilization, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Boayo, Suleiman Mohammed Hussein. The Role of Morality Akhlaq in the Rise and Decline of Civilizations: Aspects of the Muslim Intepretation of Roman Civilization's Decline. Kuala Lumpur: International Institute of Islamic Thought and Civilization, International Islamic University Malaysia, 2006.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Boayo, Suleiman Mohammed Hussein. The Role of Morality Akhlaq in the Rise and Decline of Civilizations: Aspects of the Muslim Intepretation of Roman Civilization's Decline. International Institute of Islamic Thought and Civilization, International Islamic University Malaysia, 2006.