Younis, M., and R. Jame. “Abdul Rahman Al- Dakhl Relationship With the Abbasid Caliphate in Baghdad (138-172 AH/756-788 AD )”. Tishreen University Journal- Arts and Humanities Sciences Series, vol. 41, no. 6, Dec. 2019, https://journal.tishreen.edu.sy/index.php/humlitr/article/view/9265.