Abdul Hamid, Hamizul bin, Ahmad Faisal Abdul Hamid, and Adibah Abdul Wahab. “Development of Zakat Collection During Caliph Umar Al-Khattab”. Al-Muqaddimah: Online Journal of Islamic History and Civilization 6, no. 1 (January 1, 2019): 28–42. Accessed May 8, 2024. https://ejournal.um.edu.my/index.php/MUQADDIMAH/article/view/15708.