Admiralty, Tactical and Staff Duties Division, Ministry of Defence, Naval Historical Branch, The U-Boat War in the Atlantic, 1939-May 1945 (German Naval History Series)(BR 305)(3 vols.: London 1950-77); Jurgen Rohwer, Axis Submarine Successes 1939-1945 (Annapolis, Md.
Admiralty, Tactical and Staff Duties Division, Ministry of Defence, Naval Historical Branch, The U-Boat War in the Atlantic, 1939-May 1945 (German Naval History Series) (BR 305), Londres, 1950-1977, 3 volumes; Jurgen Rohwer, Axis Submarine Successes 1939-1945, Annapolis (Maryland), 1983; ____ et G. Hummelchen, Chronology of the War at Sea, 1939-1945, Londres, 1974, 2 volumes.