APA (7th ed.) Citation

Donnell, C., & Delf, B. (2008). The German fortress of Metz, 1870-1944. Osprey.

Chicago Style (17th ed.) Citation

Donnell, Clayton, and Brian Delf. The German Fortress of Metz, 1870-1944. Oxford: Osprey, 2008.

MLA (9th ed.) Citation

Donnell, Clayton, and Brian Delf. The German Fortress of Metz, 1870-1944. Osprey, 2008.

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