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* L.Keppie, ''The making of the roman army'', University of Oklahoma 1998.
* H.Parker, ''Roman Legions'', New York 1993.
* C.Scarre, ''The Penguin historical atlas of ancient Rome'', 1995. ISBN 0-14-051329-9
* H.Schonberger, ''The Roman Frontier in Germany: An Archaeological Survey'', in ''Journal of Roman Studies'' N.59, Exeter 1969, pp.149 ss.
* P.Southern, ''The Roman Empire: from Severus to Constantine'', Londra & New York, 2001. ISBN 0-415-23944-3
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