Baker, P.  

'The Armies and Enemies of Imperial Rome,' W.R.G. 1972

Bowman, Alan. K.  

'Life and Letters on the Roman Frontier,' British Museum Press, 1998

Burn, Alfred H.  

'The Battlefields of England,' Vol I and II, Greenhill Books, 1996

Ellis, Peter Berresford.  

'The Celtic Empire,' Constable, London. 1993

Fuller, General J.F.C.  

'Julius Caesar, Man, Soldier, and Tyrant,' Da Capo Press, New Jersey, 1965

Joseph, St, J.K.S and Frere,S.S.. 

'Roman Britain from the Air,' Cambridge University Press, 1983

Josephus, 

'The Jewish War,' Penguin Classics, 1981

Legg, Rodney.  

'Romans in Britain,' London, 1993

Levick, Barbara.

'Claudius,' Batsford Books, London, 1993

Luttwark, Edward.  

'The Grand Strategy of the Roman Empire,' John Hopkins University Press, 1979

Tacitus.  

'The Annals of Imperial Rome,' Penguin Classics, 1996

Williams, Derek.  

'Romans and Barbarians,' Constable, London, 1998