Јован Орфанотроф — разлика између измена

* Charles M. Brand, Alexander Kahzdan and Anthony Cutler, 'John the Orphanotrophos' in Oxford Dictionary of Byzantium (New York: Oxford University Press, 1991), Vol. 2. ppстр. 1070.

* Kathyrn M. Ringrose, The Perfect Servant: Eunuchs and the Social Construction of Gender in Byzantium (Chicago: University of Chicago Press,) (2003). ppстр. 191–193191.–193.