Charles Joseph Hefele, A History of the Councils of the Church: from the Original Documents, to the close of the Second Council of Nicaea A.D. 787 (Wipf and Stock Publishers, 1 Feb. 2007 ) p179.
Claude Fleury, John Henry Newman, The Ecclesiastical History of M. L'abbé Fleury: From the Second Ecumenical Council to the End of the Fourth Century (John Henry Parker, 1842) p250.
SaintAugustine, Letters, Volume 2 (83–130) (The Fathers of the Church, Volume 18) letter 88.
catholic-hierarchy.org
David M. Cheney Casae Nigrae at catholic-hierarchy.org.
Fentress, E., R. Warner, R. Talbert, T. Elliott, S. Gillies. "Places: 334514 (Casae Nigrae)". Pleiades. <http://pleiades.stoa.org/places/334514> [Accessed: February 19, 2016]