APA (7th ed.) Citation

(1988). Thomas R. Johnson, Operation REGAL: The Berlin Tunnel, U.S. Cryptologic History, Special Series, Vol. 4 (Ft. George G. Meade: Center for Cryptologic History, 1988), Top Secret Umbra.

Chicago Style (17th ed.) Citation

Thomas R. Johnson, Operation REGAL: The Berlin Tunnel, U.S. Cryptologic History, Special Series, Vol. 4 (Ft. George G. Meade: Center for Cryptologic History, 1988), Top Secret Umbra. 1988.

MLA (8th ed.) Citation

Thomas R. Johnson, Operation REGAL: The Berlin Tunnel, U.S. Cryptologic History, Special Series, Vol. 4 (Ft. George G. Meade: Center for Cryptologic History, 1988), Top Secret Umbra. 1988.

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