* Karl Dönitz, "Memoirs: Ten Years and Twenty Days" (New York: World Publishing Company, 1958)* Peter Maas, "The Terrible Hours: The Man Behind the Greatest Submarine Rescue in History" (HarperCollins New York, 1999)* E. B. Potter and Chester W. Nimitz, eds; "Sea Power: A Naval History" (Englewood Cliffs, N.J.: Prentice-Hall, 1960)
== See also ==* List of wolfpacks of World War II* Convoy SC-7 for an account of one of the first Allied convoys to suffer a wolfpack attack== References ==* Karl Dönitz, "Memoirs: Ten Years and Twenty Days" (New York: World Publishing Company, 1958)* Peter Maas, "The Terrible Hours: The Man Behind the Greatest Submarine Rescue in History" (HarperCollins New York, 1999)* E. B. Potter and Chester W. Nimitz, eds; "Sea Power: A Naval History" (Englewood Cliffs, N.J.: Prentice-Hall, 1960)