View of Mansour, Ahmad Ibrahim. “A Study in the Methodology of Economic Efficiency: ʿUmrān and Khaldūnian Reason as a Model,” Year 13, Issue 51 (Winter 1429 AH/ 2008 CE), Pp. 263 -284. | Al-Fikr al-islāmī al-muʿāṣir (previously Islamiyat al-Ma'rifah)