APA (7th ed.) Citation

Butler lhWilliam S. & Keeney. Secret messages: Concealment, codes, and other types of ingenious communication.

Chicago Style (17th ed.) Citation

Butler lhWilliam S. and Keeney. Secret Messages: Concealment, Codes, and Other Types of Ingenious Communication. New York lbSimon & Schuster lc2001.

MLA (9th ed.) Citation

Butler lhWilliam S. and Keeney. Secret Messages: Concealment, Codes, and Other Types of Ingenious Communication.

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