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APA Citation
Good, I. J., Michie, D., & Timms, G. (. (2015). Breaking teleprinter ciphers at Bletchley Park : general report on Tunny with emphasis on statistical methods (1945). Hoboken, New Jersey Piscataway, New Jersey : Wiley IEEE Press. http://access.bl.uk/ark:/81055/vdc_100026533667.0x000001