ABBA, A. (2007). The Northern elements progressive union and the politics of radical nationalism in Nigeria, 1938-1960. The Abdullahi Smith Centre for Historical Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)ABBA, Alkasum. The Northern Elements Progressive Union and the Politics of Radical Nationalism in Nigeria, 1938-1960. The Abdullahi Smith Centre for Historical Research, 2007.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)ABBA, Alkasum. The Northern Elements Progressive Union and the Politics of Radical Nationalism in Nigeria, 1938-1960. The Abdullahi Smith Centre for Historical Research, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.