==Further reading====External links==* The Enigma Code Breach by Jan Bury: an account of the Polish role* The Breaking of Enigma by the Polish Mathematicians by Tony Sale* How Mathematicians Helped Win WWII — National Security Agency* Enigma documents* Marian Rejewski and the First Break into Enigma
На английском:* The Enigma Code Breach by Jan Bury: an account of the Polish role* The Breaking of Enigma by the Polish Mathematicians by Tony Sale* Untold Story of Enigma Code-Breaker — The Ministry of Defence (U.K.)* How Mathematicians Helped Win WWII — National Security Agency* Enigma documents* Rejewski biography, University of St Andrews