" Singh, S. The code book: The secret history of codes and code-breaking. Forth Estate Ltd.
Chicago Style (17. basım) Atıf" Singh, Simon". The Code Book: The Secret History of Codes and Code-breaking. Forth Estate Ltd.
MLA (9th ed.) Atıf" Singh, Simon". The Code Book: The Secret History of Codes and Code-breaking. Forth Estate Ltd.
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