APA (7th ed.) Citation

Singh, S. (1999). The code book: The evolution of secrecy from Mary, Queen of Scots, to quantum cryptography. Doubleday.

Chicago Style (17th ed.) Citation

Singh, Simon. The Code Book: The Evolution of Secrecy from Mary, Queen of Scots, to Quantum Cryptography. New York: Doubleday, 1999.

MLA (9th ed.) Citation

Singh, Simon. The Code Book: The Evolution of Secrecy from Mary, Queen of Scots, to Quantum Cryptography. Doubleday, 1999.