Dar al-Khilafa (Samarra)
C. E. Bosworth. "al-Mu'taṣim Bi ’llāh." Encyclopaedia of Islam, Second Edition. http://dx.doi.org/10.1163/1573-3912_islam_SIM_5656 [Accessed November 21, 2017].
C. E. Bosworth. "al-Mu'taṣim Bi ’llāh." Encyclopaedia of Islam, Second Edition. http://dx.doi.org/10.1163/1573-3912_islam_SIM_5656 [Accessed November 21, 2017].