APA (7th ed.) Citation

Chappell, M. (2003). The British Army in World War I. Osprey.

Chicago Style (17th ed.) Citation

Chappell, Mike. The British Army in World War I. Oxford: Osprey, 2003.

MLA (9th ed.) Citation

Chappell, Mike. The British Army in World War I. Osprey, 2003.