APA (7th ed.) Citation

Showell, J. P. M. (2013). U-boats of the Second World War: Their longest voyages. Fonthill Media.

Chicago Style (17th ed.) Citation

Showell, Jak P. Mallmann. U-boats of the Second World War: Their Longest Voyages. [Stroud, Gloucestershire, England]: Fonthill Media, 2013.

MLA (9th ed.) Citation

Showell, Jak P. Mallmann. U-boats of the Second World War: Their Longest Voyages. Fonthill Media, 2013.