APA (7th ed.) Citation

Singh. (1999). The code book: The science of secrecy from ancient Egypt to quantum cryptography. Anchor Books.

Chicago Style (17th ed.) Citation

Singh. The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography. New York: Anchor Books, 1999.

MLA (8th ed.) Citation

Singh. The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography. Anchor Books, 1999.

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