Sources
- Bamford, James (1982). The Puzzle Palace: Inside the National Security Agency, America's Most Secret Intelligence Organization. Penguin. ISBN 978-0-14-006748-4.
- Kahn, David (1967). The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet. Scribner (later reprinted by Macmillan, 1996). ISBN 978-0-684-83130-5.
Read more about this topic: David Kahn (writer)
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