Marie-Thérèse d'Alverny, "Translations and Translators," in Renaissance and Renewal in the Twelfth Century (University of Toronto Press, 1991), p. 438 online.
Sideris, Georges (2009-06-02). "Eunuchs of Light': Power, Imperial, Ceremonial and Positive Representations of Eunuchs in Byzantium (4th-12th centuries AD)". In Tougher, Shaun (ed.). The Eunuch in Byzantine History and Society. Routledge. pp. 163, 166. ISBN978-1-135-23570-3.
