Rahmi, A. F., A. A. H. A. Royyan, and A. Abdulrahman. “Umar Bin Abdul Aziz: A Portrait of a Just Leader and Its Relevance for Today’s Leadership”. Proceedings of International Conference on Islamic Civilization and Humanities, Vol. 3, June 2025, pp. 452-60, https://proceedings.uinsa.ac.id/index.php/iconfahum/article/view/3256.