Barnes 1982, p. 57; Bowman 2005, p. 71; Rees 2002, p. 31. (EN) Timothy Barnes, The New Empire of Diocletian and Constantine, Cambridge, MA Harvard University Press, 1982, ISBN0-7837-2221-4. (EN) Alan K. Bowman, Diocletian and the First Tetrarchy, Cambridge, The Cambridge Ancient History, Volume XII: The Crisis of Empire, a cura di Alan Bowman, Averil Cameron, e Peter Garnsey, 2005, ISBN0-521-30199-8. (EN) Roger Rees, Layers of Loyalty in Latin Panegyric: AD 289–307, New York, Oxford University Press, 2002, ISBN0-19-924918-0.