" Singh, S. The code book: The secret history of codes and code-breaking. Forth Estate Ltd.
Cita Chicago (17th ed.)" Singh, Simon". The Code Book: The Secret History of Codes and Code-breaking. Forth Estate Ltd.
Cita MLA (9th ed.)" Singh, Simon". The Code Book: The Secret History of Codes and Code-breaking. Forth Estate Ltd.
Atenció: Aquestes cites poden no estar 100% correctes.