Telegramma Zimmermann: differenze tra le versioni
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* ''Room 40: British Naval Intelligence, 1914-1918'', di Patrick Beesly. New York: Harcourt, Brace, Jovanovich, 1982 ISBN 0-15-178634-8
* ''On Secret Service East of Constantinople'', di Peter Hopkirk. Oxford University Press, 1994 ISBN 0-19-280230-5
* ''The Zimmermann Telegram'', di [[Barbara W. Tuchman]], Ballantine Books,
* ''The Zimmermann Telegram of January 16, 1917 and its Cryptographic Background'' di William F. Friedman e Charles J. Mendelsohn: . War Department, Office of the Chief Signal Officer, Washington, GPO, 1938
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