Suharto, Ugi. “Zakat As a Special Institution of Public Finance: Reflections from Kitab Al-Amwal of Abu ’Ubayd (d.224/838)”. Al-Shajarah: Journal of the International Institute of Islamic Thought and Civilization (ISTAC) 6, no. 1 (November 18, 2014). Accessed July 18, 2024. https://journals.iium.edu.my/shajarah/index.php/shaj/article/view/138.