Downing, T. (2015). Secret warriors: The spies, scientists and code breakers of World War I (First hardcover edition.). Pegasus Books.
Style de citation Chicago (17e éd.)Downing, Taylor. Secret Warriors: The Spies, Scientists and Code Breakers of World War I. First hardcover edition. New York: Pegasus Books, 2015.
Style de citation MLA (8e éd.)Downing, Taylor. Secret Warriors: The Spies, Scientists and Code Breakers of World War I. First hardcover edition. Pegasus Books, 2015.
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