The Battle of the Atlantic, September 1939-May 1943, (History of United States Naval Operations in World War II, Volume I.)by Samuel Eliot Morison;The Army Air Forces in World War II, Volume I, Plans and Early Operations, January 1939 to August 1942.by Wesley Frank Craven; James Lee Gate; Air Historical Office;U. S. Army in World War II, The Procurement and Training of Ground Combat Troops.by Robert R. Palmer; Bell I. Wiley; William R. Keast