" Singh, S. The code book: The secret history of codes and code-breaking. Forth Estate Ltd.
芝加哥风格引文" Singh, Simon". The Code Book: The Secret History of Codes and Code-breaking. Forth Estate Ltd.
MLA引文" Singh, Simon". The Code Book: The Secret History of Codes and Code-breaking. Forth Estate Ltd.
警告：这些引文格式不一定是100％准确.