| by Showell, Jak P. Mallmann A Reference Guide to the Kriegsmarine, 1935-1945 1979, Arms & Armour ISBN 0853680930 Contains some U-boat info. |
Translations of this title include:
| by Showell, Jak P. Mallmann (The German Navy in World War Two) 1993, Fratelli Melita Editori, La Spezia 223 pages, hardcover, b&w photos | |
| by Showell, Jak P. Mallmann (The German Navy in World War II) 1992, Motorbuch Verlag, Stuttgart ISBN 3879438803 Hardcover, numerous b&w photos and maps | |
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