Waller J. The Myth of the Rogue Elephant Interred, Studies in Intelligence 22:3. – Washington, DC: Central Intelligence Agency, 1978, p. 6–7.
570
U. S. Congress, Senate, Select Committee to Study Government Operations with Respect to Intelligence Activities. Foreign and Military Intelligence Final Report, Book 1. 94th Congress, 2nd Sess., April 26, 1976.
