APA (7th ed.) Citation

Koop, Brooks, & Schmolke. (2003). German destroyers of World War II. Greenhill Books.

Chicago Style (17th ed.) Citation

Koop, Brooks, and Schmolke. German Destroyers of World War II. London: Greenhill Books, 2003.

MLA (8th ed.) Citation

Koop, et al. German Destroyers of World War II. Greenhill Books, 2003.