Raana, I. M. (1970). Economic system under Umar the Great: A treatise on Muslim economy in early seventh century (First edition.). Sh. Muhammad Ashraf.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Raana, Irfan Mahmud. Economic System Under Umar the Great: A Treatise on Muslim Economy in Early Seventh Century. First edition. Lahore: Sh. Muhammad Ashraf, 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Raana, Irfan Mahmud. Economic System Under Umar the Great: A Treatise on Muslim Economy in Early Seventh Century. First edition. Sh. Muhammad Ashraf, 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.