Robert Jackson, Steve Crawford - Fighting Ships of the World: Over 600 Carriers, Submarines & Destroyers Amber Books | 2004 | ISBN: 1904687016 | English | 616 pages | PDF | 256.03 MB
The Theory That Would Not Die: How Bayes' Rule Cracked the Enigma Code, Hunted Down Russian Submarines, and Emerged Triumphant from Two Centuries of Controversy By Sharon Bertsch McGrayne 2011 | 336 Pages | ISBN: 0300169698 | EPUB | 1 MB
Austrougarske Podmornice u I. Svjetskom Ratu / Austro-Hungarian Submarines in World War I 2007 | ISBN: 9532193391 | Croatian/English | 121 Pages | PDF | 132 MB
Norman Polmar - Submarines of the Russian and Soviet Navies 1718-1990 Naval Institute Press | 1991 | ISBN: 0870215701 | English | 382 pages | PDF | 179.67 MB