"Testimony of Mark Zborowski, Accompanied by Herman A. Greenberg, Esq., his Attorney", Scope of Soviet Activity in the United States, Hearing Before the Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security Laws of the Committee On the Judiciary, United States Senate, Eighty-Fourth Congress, Second Session, February 29, 1956, Part 4. Washington, Government Printing Office, 1956,page 92. (Available online)
