Cite
MLA Citation
Brian Clegg. Enigma : crack the ultimate cipher challenge!. London : Icon Books, 2018. http://access.bl.uk/ark:/81055/vdc_100081191749.0x000001
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Brian Clegg. Enigma : crack the ultimate cipher challenge!. London : Icon Books, 2018. http://access.bl.uk/ark:/81055/vdc_100081191749.0x000001