* James Gannon, Stealing Secrets, Telling Lies: How Spies and Codebreakers Helped Shape the Twentieth Century, Washington, D. C., Brassey's, 2001: an overview of major 20th-century episodes in cryptology and espionage, particularly strong regarding the misappropriation of credit for conspicuous achievements.

* James Gannon, Stealing Secrets, Telling Lies: How Spies and Codebreakers Helped Shape the Twentieth century, Washington, D. C., Brassey's, 2001, especially chapter 6: Who Broke Purple?

* James Gannon, Stealing Secrets, Telling Lies: How Spies and Codebreakers Helped Shape the Twentieth Century, Washington, D. C., Brassey's, 2001, ISBN 1-57488-367-4.

* James Gannon, Stealing Secrets, Telling Lies: How Spies and Codebreakers Helped Shape the Twentieth Century, Washington, D. C., Brassey's, 2001.

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