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Nicolas Werth, Karel Bartosek, Jean-Louis Panne, Jean-Louis Margolin, Andrzej Paczkowski, Stephane Courtois, Black Book of Communism: Crimes, Terror, Repression, Harvard University Press, 1999, hardcover, 858 pages, ISBN 0-674-07608-7. Chapter 4: The Red Terror

George Leggett, The Cheka: Lenin's Political Police. Oxford University Press, 1987, ISBN 0-19-822862-7

Melgounov, Sergey Petrovich (1925) The Red Terror in Russia. London & Toronto: J. M. Dent & Sons Ltd