APA (7th ed.) Citation

Showell, J. P. M. (1987). U-boats under the Swastika (Second edition.). Naval Institute Press.

Chicago Style (17th ed.) Citation

Showell, Jak P. Mallmann. U-boats Under the Swastika. Second edition. Annapolis, Md.: Naval Institute Press, 1987.

MLA (9th ed.) Citation

Showell, Jak P. Mallmann. U-boats Under the Swastika. Second edition. Naval Institute Press, 1987.