Originally published in digital format: Coda Books, 2011.
Originally compiled by Günter Hessler from war diaries and primary sources of the German Navy under the supervision of the U.S. Navy Department and the British Admiralty.
v. 1. 1939-1941
v. 2. 1942-1943
v. 3. 1944-1945.
The U-boat war in the Atlantic. ISBN 9781781591611. Published by Pen & Sword Maritime in 2013. Publication and catalogue information, links to buy online and reader comments.