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Baris 48: {{refbegin\|30em}} * Jenkins, Peter. ''Surveillance Tradecraft: The Professional's Guide to Surveillance Training'' ISBN 978-0-9535378-2-2 * Felix, Christopher [pseudonym for James McCarger] {{cite web \|title=Intelligence Literature: Suggested Reading List \|url = https://www.cia.gov/library/intelligence-literature/index.html#espionage \|publisher=US CIA \|accessdate = September 2, 2012 }} ''A Short Course in the Secret War, 4th Edition''. Madison Books, November 19, 2001. * West, Nigel. ''MI6: British Secret Intelligence Service Operations 1909–1945'' 1983 * Smith Jr., W. Thomas. ''[[Encyclopedia of the Central Intelligence Agency]]'' 2003 Baris 67: * May, Ernest (ed.) ''Knowing One's Enemies: Intelligence Assessment before the Two World Wars'' 1984 * Tuchman, Barbara W. ''The Zimmermann Telegram'' Ballantine Books 1966 * Words: Matt Bolton; photographs: Matt Munro. [http://www.hot.ee/aasa/LPL_1211.pdf "The Tallinn Cables: A Glimpse into Tallinn's Secret History of Espionage"] {{Webarchive\|url=https://web.archive.org/web/20131113200915/http://www.hot.ee/aasa/LPL_1211.pdf \|date=2013-11-13 }}. Lonely Planet Magazine, December 2011 {{refend}}

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