APA (7th ed.) Citation

Downing, T. (2015). Secret warriors: The spies, scientists and code breakers of World War I (First hardcover edition.). Pegasus Books.

Chicago Style (17th ed.) Citation

Downing, Taylor. Secret Warriors: The Spies, Scientists and Code Breakers of World War I. First hardcover edition. New York: Pegasus Books, 2015.

MLA (8th ed.) Citation

Downing, Taylor. Secret Warriors: The Spies, Scientists and Code Breakers of World War I. First hardcover edition. Pegasus Books, 2015.

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