Haji Hamzah, Norhayati. “The Government of Khurasan Under Harun Al-Rashid (A.H. 170-193 / A.D. 786-808)”. Jurnal Usuluddin 17 (June 30, 2003): 163–184. Accessed July 4, 2024. http://mjs.um.edu.my/index.php/JUD/article/view/4082.