توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Umar, M. M. (2013). Free trade area of the ECOWAS: An evaluation of its achievements and challenges (1990-2010). Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Umar, Muhammad Muhammad. Free Trade Area of the ECOWAS: An Evaluation of Its Achievements and Challenges (1990-2010). Kuala Lumpur: Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia, 2013.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Umar, Muhammad Muhammad. Free Trade Area of the ECOWAS: An Evaluation of Its Achievements and Challenges (1990-2010). Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia, 2013.