APA Style

Gilbert, Adrian. (2008). Spy Files : Codes and Ciphers . London: QED Publishing.

Chicago Style

Gilbert, Adrian. Spy Files : Codes and Ciphers. London: QED Publishing, 2008. Text.

MLA Style

Gilbert, Adrian. Spy Files : Codes and Ciphers. London: QED Publishing, 2008. Text.

Turabian Style

Gilbert, Adrian. Spy Files : Codes and Ciphers. London: QED Publishing, 2008. Print.