APA (7th ed.) Citation

Showell. (2002). Hitler's U-Boat Bases. Sutton Publishing.

Chicago Style (17th ed.) Citation

Showell. Hitler's U-Boat Bases. Gloucestershire: Sutton Publishing, 2002.

MLA (8th ed.) Citation

Showell. Hitler's U-Boat Bases. Sutton Publishing, 2002.

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