إسماعيل صلاح. “Ismail, Salah. ‘The Study of Concepts from a Philosophical Angle,’ Year 2, Issue 8 (Spring 1416 AH 1997 CE), Pp. 11-38”. Al-Fikr Al-islāmī Al-muʿāṣir (previously Islamiyat Al-Ma’rifah), vol. 2, no. 8, Apr. 1997, pp. 38-9, doi:10.35632/citj.v2i8.1967.