" Singh, S. The code book: The secret history of codes and code-breaking. Forth Estate Ltd.
Dyfyniad Arddull Chicago" Singh, Simon". The Code Book: The Secret History of Codes and Code-breaking. Forth Estate Ltd.
Dyfyniad MLA" Singh, Simon". The Code Book: The Secret History of Codes and Code-breaking. Forth Estate Ltd.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.