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), [S. l.], v. 2, n. 8, p. 38–9, 1997. DOI: 10.35632/citj.v2i8.1967. Disponível em: https://citj.org/index.php/citj/article/view/1967. Acesso em: 2 may. 2026.