Abdullah, Suhaila, and Nurliyana Mohd Talib. “The Decline of the Umayyad Caliphate in Andalus Based on Ibn Khaldun’s Theory”. Journal of Al-Tamaddun 18, no. 2 (December 31, 2023): 39–51. Accessed May 12, 2024. https://ejournal.um.edu.my/index.php/JAT/article/view/32464.