Burnett, Andrew M. Coinage in the Roman World. London: Seaby, 1987.
Carradice, Ian A. and Theodore V. Buttrey. The Roman Imperial Coinage, vol. 2, pt. 1, Vespasian to Domitian, 2nd rev. ed. London: Spink, 2007.
Crawford, Michael H. Roman Republican Coinage, 2 vols. Cambridge: Cambridge University Press, 1983.
Hill, Philip. "Monuments of Ancient Rome as Coin Types," in The Numismatic Chronicle,143 (1983), 81-94.
Kent, John P. C. Roman Coins, rev. edition. London: Thames and Hudson, 1978.