NAWWAF, Zaben.
 The Emergence of the position of Prince of Princes and Its Impact on the Authority of the Caliphate and the Ministry: Muhammad bin Raiq and Caliph al-Radi as a Model.
<strong>Journal of Tikrit university for humanities - مجلة جامعة تكريت للعلوم الانسانية</strong>, [S.l.], v. 27, n. 4, p. 252-235, june 2020.
ISSN 1817-6798. Available at: &lt;<a href="https://jtuh.tu.edu.iq/index.php/hum/article/view/1026" target="_new">https://jtuh.tu.edu.iq/index.php/hum/article/view/1026</a>&gt;. Date accessed: 10 may 2024.
doi: <a href="http://dx.doi.org/10.25130/hum.v27i4.1026">http://dx.doi.org/10.25130/hum.v27i4.1026</a>.