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* Helen Fouché Gaines, “Cryptanalysis”, 1939, Dover. ISBN 0-486-20097-3
* David Kahn, ''The Codebreakers - The Story of Secret Writing'' (ISBN 0-684-83130-9) (1967)
* Abraham Sinkov, ''Elementary Cryptanalysis: A Mathematical Approach'', Mathematical Association of America, {{page|year=1966. |id=ISBN 0-88385-622-0|pages=}}
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