İKİNCİ DÜNYA SAVAŞI KONULU 5 ADET KİTAP (İNGİLİZCE)

David Kahn, Seizing The Enigma, The Race to Break the German U-Boats Codes 1939-1943, Houghton Mifflin Co, 1991
Stephen Budiansky, Battle of Wits, The Complete Story of Codebreaking in World War II, Penguin Group, 2000
Stephen Harper, Capturing Enigma, How HMS Petard Seized the German Naval Codes, Sutton Publishing, 1999
David Kahn, The Code-Breakers, Sphere Books Ltd, 1973
F.H. Hinsley & Alan Stripp (Ed), Code Breakers, The Inside Story of the Bletchley Park, Oxford University Press, 1994