APA (7th ed.) Citation

Breyer, S., & Koop, G. (1989). The German navy at war, 1935-1945. Schiffer Pub..

Chicago Style (17th ed.) Citation

Breyer, Siegfried, and Gerhard Koop. The German Navy at War, 1935-1945. West Chester, Pa.: Schiffer Pub., 1989.

MLA (9th ed.) Citation

Breyer, Siegfried, and Gerhard Koop. The German Navy at War, 1935-1945. Schiffer Pub., 1989.