Foydalanilgan manbalar:
1.
David Kahn, The Codebreakers
1967. pp. 192-195.
2.
Mavis Batey, Dilly,
The Man Who Broke Enigmas
2009. Hard cover, ISBN 978-1-906447-01-4.
3.
Frode Weierud, Personal correspondence
August 2017.
4.
Dennis Richie, Dabbling in the
Cryptographic World - A Story
Updated 5 May 2000. Retrieved November 2011.
5.
Collection of M-209 patent and license agreements
A66684. Declassified by NSA on 11 June 2014 (EO 13526).
6.
Jean-Francois Bouchaudy, M-209
Cryptanalysis
Retrieved July 2016.
7.
Internet saytlar:
8.
https://www.cryptomuseum.com/crypto/usa/jefferson/index.htm
https://www.cryptomuseum.com/crypto/enigma/hist.htm
https://www.cryptomuseum.com/crypto/hagelin/m209/index.htm
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