Jabarkan Sumber dari Erwigius

Collins, Roger. Visigothic Spain, 409–711. Blackwell Publishing, 2004.

Livermore, Harold. The Twilight of the Goths: The Rise and Fall of the Kingdom of Toledo, c. 565–711. Bristol: Intellect, 2006.

Murphy, Francis X. "Julian of Toledo and the Fall of the Visigothic Kingdom in Spain." Speculum, Vol. 27, No. 1. (January, 1952), pp 1–27.

Thompson, E. A.. The Goths in Spain. Oxford: Clarendon Press, 1969.

Continuité des élites à Byzance durante les siècles obscurs. Les princes caucasiens et l'Empire du VIe au IXe siècle. 2006.