APA (7th ed.) Citation

Campbell, D. B. (2006). Roman legionary fortresses: 27 BC - AD 378 (1. publ.). Osprey.

Chicago Style (17th ed.) Citation

Campbell, Duncan B. Roman Legionary Fortresses: 27 BC - AD 378. 1. publ. Oxford: Osprey, 2006.

MLA (9th ed.) Citation

Campbell, Duncan B. Roman Legionary Fortresses: 27 BC - AD 378. 1. publ. Osprey, 2006.

Warning: These citations may not always be 100% accurate.