APA (7th ed.) Citation

(1988). Operation Regal: The Berlin Tunnel (S-CCO) [strikethrough]. National Security Agency/Central Security Service.

Chicago Style (17th ed.) Citation

Operation Regal: The Berlin Tunnel (S-CCO) [strikethrough]. [Fort George G. Meade, Md.]: National Security Agency/Central Security Service, 1988.

MLA (9th ed.) Citation

Operation Regal: The Berlin Tunnel (S-CCO) [strikethrough]. National Security Agency/Central Security Service, 1988.

Warning: These citations may not always be 100% accurate.