References 

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  Campbell, J. Brian.  The Roman Army, 31 BC - AD 337: a Sourcebook.  London: Routledge, 1996.
  Connolly, Peter.  Greece and Rome at War.  London: Macdonald, 1988.
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  Howe, L.  The Praetorian Prefecture from Commodus to Diocletian.  Chicago, 1942.
  Kennedy, David.  "Some observations on the Praetorian Guard," Ancient Society 9 (1978), pp 275-301.
  Keppie, Lawrence.  The Making of the Roman Army.  London: Batsford, 1984.
  Passerini, Alfredo.  Le coorti pretorie.  Rome, 1939.
  Rankov, Boris.  The Praetorian Guard.  Osprey Elite Series, No. 50, editor Lee Johnson.  London: Osprey, 1994.
  Robinson, H. Russell.  The Armour of Imperial Rome.  New York: Scribner, 1975.
  Speidel, Michael.  Riding for Caesar: the Roman Emperors' Horse Guards.  Cambridge: Harvard UP, 1994.
  Syme, R.  "Guard prefects of Trajan and Hadrian," Journal of Roman Studies 70 (1980), pp 64-80.