Butcher, K., Ponting, M., Evans, J., Pashley, V., & Somerfield, C. (2014). The metallurgy of Roman silver coinage: From the reform of nero to the reform of trajan. Cambridge University Press.

Butcher, Kevin, Matthew Ponting, Jane Evans, Vanessa Pashley, và Christopher Somerfield. The Metallurgy of Roman Silver Coinage: From the Reform of Nero to the Reform of Trajan. UK: Cambridge University Press, 2014.

Butcher, Kevin, et al. The Metallurgy of Roman Silver Coinage: From the Reform of Nero to the Reform of Trajan. Cambridge University Press, 2014.