Umar, H. M. (2014). Regional disparities and the role of education in income determination and distribution: The empirical evidence from Nigeria.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Umar, Habibu Mohammed. Regional Disparities and the Role of Education in Income Determination and Distribution: The Empirical Evidence from Nigeria. 2014.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Umar, Habibu Mohammed. Regional Disparities and the Role of Education in Income Determination and Distribution: The Empirical Evidence from Nigeria. 2014.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.