APA (7th ed.) Citation

James, W. M. (1956). The code breakers of Room 40: The story of Admiral Sir William Hall, genius of British counter-intelligence. St. Martin's Press.

Chicago Style (17th ed.) Citation

James, W. M. The Code Breakers of Room 40: The Story of Admiral Sir William Hall, Genius of British Counter-intelligence. New York: St. Martin's Press, 1956.

MLA (9th ed.) Citation

James, W. M. The Code Breakers of Room 40: The Story of Admiral Sir William Hall, Genius of British Counter-intelligence. St. Martin's Press, 1956.