References
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- Givierge, M. 1978. Course in Cryptography, Laguna Hills, CA: Aegean Park Press.
- Kahn, D. 1983. Kahn on Codes: Secrets of the New Cryptology, New York: McMillan.
- Kahn, D. 1998. Seizing the Enigma: The Race to Break the German U-Boat Codes, New York: Barnes and Nobel Books.
- Kapera, Z. 2011. In the Shadow of Pont du Gard: The Polish Enigma in Vichy France (June 1940 to November 1942), Krakow: The Enigma Press.
- Rejewski, M. 2013. Memories of My Work at the Cipher Bureau of the General Staff Second Department 1930–1945, Poznań: Adam Mickiewicz University Press.