العوضي رفعت السيد. “Al-Awadi, Rifʿat Al-Sayyed. ‘Ibn Khaldūn and His Pioneering of Economic Studies: An Inquiry into the Epistemological Dimension,’ Year 13, Issue 51 (Winter 1429 AH 2008 CE), Pp. 241-262”. Al-Fikr Al-islāmī Al-muʿāṣir (previously Islamiyat Al-Ma’rifah), vol. 13, no. 51, Jan. 2008, p. 241262, doi:10.35632/citj.v13i51.1219.