Tolong jelaskan mengenai Lihat juga dari Masa Bahagia Kedua dalam bahasa melayu

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Behrens, C. B. A. Merchant Shipping and the Demands of War. London: H.M. Stationery Office, 1955.

Blair, Clay Hitler's U-Boat War: The Hunters 1939–1942 Random House (1996)

Churchill, Winston. The Second World War Vol. IV: The Grand Alliance. Boston: Houghton Mifflin, 1950.

Ellis, John. The World War II Databook: The Essential Facts and Figures for All the Combatants. London: Aurum Press, 1993. .

Fairbank White, David. Bitter Ocean: The dramatic story of the Battle of the Atlantic 1939–1945, 2006, Headline Publishing Group, .

Gannon, Michael. Operation Drumbeat: The Dramatic True Story of Germany's First U-Boat Attacks Along the American Coast in World War II. New York: Harper & Row, 1990. .

Morison, Samuel Eliot. A History of U.S. Naval Operations in World War II Vol. I: The Battle of the Atlantic, September 1939 – May 1943. Boston: Little, Brown, 1947.

Roskill, Stephen Wentworth. The War at Sea, 1939–1945: The Period of Balance. II. London: H.M. Stationery Office, 1956.

U-Boat War. (2001). BFS Video. . .