APA (7th ed.) Citation

Singh, S. (2000). The code book : the secret history of codes and codebreaking / Simon Singh: The secret history of codes and codebreaking. Fourth Estate.

Chicago Style (17th ed.) Citation

Singh, Simon. The Code Book : The Secret History of Codes and Codebreaking / Simon Singh: The Secret History of Codes and Codebreaking. London: Fourth Estate, 2000.

MLA (9th ed.) Citation

Singh, Simon. The Code Book : The Secret History of Codes and Codebreaking / Simon Singh: The Secret History of Codes and Codebreaking. Fourth Estate, 2000.

Warning: These citations may not always be 100% accurate.