Description historique des monnaies frappées sous l 'Empire Romain. Nerva to Antoninus Pius. - H. Cohen (Paris, 1883)

Coins of the Roman Empire in the British Museum. Vespasian to Domitian. - H. Mattingly, R.A.G. Carson (London, 1930)

The Roman Imperial Coinage. From AD 69 to 96. - I. Carradice, T. Buttrey (London, 2007)