Sayida I, Abdullah K. The economic factor and its effect of the authority system: The Kurdish emirates during the Abbasid era as an example. Which is analyzed per Ebn Khaldon theory. HJUOZ [Internet]. 2023 Sep. 30 [cited 2024 Nov. 21];11(3):714-23. Available from: https://hjuoz.uoz.edu.krd/index.php/hum/article/view/1173