APA (7th ed.) Citation

Campbell, D. B., & Delf, B. (2006). Roman legionary fortresses, 27 BC-AD 378. Osprey.

Chicago Style (17th ed.) Citation

Campbell, Duncan B., and Brian Delf. Roman Legionary Fortresses, 27 BC-AD 378. Oxford: Osprey, 2006.

MLA (9th ed.) Citation

Campbell, Duncan B., and Brian Delf. Roman Legionary Fortresses, 27 BC-AD 378. Osprey, 2006.

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