*[https://www.senate.gov/artandhistory/history/resources/pdf/Volume3.pdf Army Signal Corps—Subversion and Espionage, October 22] (PDF). Executive Sessions Of The Senate Permanent Subcommittee On Investigations Of The Committee On Government Operations; Vol. 3. pgs. 2717-2726, U.S. Government Printing Office (1953)., Haynes & Klehr. Venona: Decoding Soviet Espionage in America. ISBN 0-300-08462-5. | *[https://www.senate.gov/artandhistory/history/resources/pdf/Volume3.pdf Army Signal Corps—Subversion and Espionage, October 22] (PDF). Executive Sessions Of The Senate Permanent Subcommittee On Investigations Of The Committee On Government Operations; Vol. 3. pgs. 2717-2726, U.S. Government Printing Office (1953)., Haynes & Klehr. Venona: Decoding Soviet Espionage in America. ISBN 0-300-08462-5. |