Haukil, H. “Fenomena Jariyah Khalifah Daulah Abbasiyah Tahun 170 H - 247 H / 786 - 861 M.”. Qurthuba: The Journal of History and Islamic Civilization, vol. 1, no. 1, Sept. 2017, pp. 86-106, http://jurnalfahum.uinsby.ac.id/index.php/qurthuba/article/view/148.