Francis Hobler: Records of Roman history, from Cnæus Pompeius to Tiberius Constantinus, as exhibited on the Roman coins, volume 1, John Bowyer Nichols and Sons, Westminster 1860, S. 210–211 Online
Edward A. Sydenham: Historical references on coins of the Roman Empire from Augustus to Gallienus, Spink & Son, London 1917 Online
