Wahab, Norazlina Abd., Zairy Zainol, Mahyuddin Abu Bakar, Ahmad Zubir Ibrahim, and Norida Minhaj. “Developing Service Quality Index for Zakat Institutions”. International Journal of Economics and Financial Issues 6, no. 7S (November 20, 2016): 249–258. Accessed March 28, 2024. https://www.econjournals.com/index.php/ijefi/article/view/3616.