United States. National Security Agency/Central Security Service. Center for Cryptologic History. (1988). Operation Regal: The Berlin Tunnel (S-CCO) [strikethrough]. National Security Agency/Central Security Service.
Chicago Style (17th ed.) CitationUnited States. National Security Agency/Central Security Service. Center for Cryptologic History. Operation Regal: The Berlin Tunnel (S-CCO) [strikethrough]. [Fort George G. Meade, Md.]: National Security Agency/Central Security Service, 1988.
MLA (8th ed.) CitationUnited States. National Security Agency/Central Security Service. Center for Cryptologic History. Operation Regal: The Berlin Tunnel (S-CCO) [strikethrough]. National Security Agency/Central Security Service, 1988.
Warning: These citations may not always be 100% accurate.