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, doi:10.15642/qurthuba.2017.1.1.86-106.