APA (7th ed.) Citation

Blackwood, G. L., & Henry, J. (2009). Mysterious messages: A history of codes and ciphers. Dutton Children's Books.

Chicago Style (17th ed.) Citation

Blackwood, Gary L., and Jason Henry. Mysterious Messages: A History of Codes and Ciphers. New York, N.Y: Dutton Children's Books, 2009.

MLA (9th ed.) Citation

Blackwood, Gary L., and Jason Henry. Mysterious Messages: A History of Codes and Ciphers. Dutton Children's Books, 2009.