"Dzerzhinsky, Felix Edmundovich." In Encyclopedia of Russian History, edited by James R. Millar, 422-423. Vol. 1. New York: Macmillan Reference USA, 2004. World History in Context (accessed November 9, 2017). http://link.galegroup.com/apps/doc/CX3404100385/WHIC?u=seve27129&xid=280b5e42.
Brovkin, Vladimir. "Red Terror." In Encyclopedia of Russian History, edited by James R. Millar, 1276-1277. Vol. 3. New York: Macmillan Reference USA, 2004. World History in Context (accessed November 9, 2017). http://link.galegroup.com/apps/doc/CX3404101116/WHIC?u=seve27129&xid=0bbd5e5a.
Glantz, David M.. "NKVD." World Book Advanced, World Book, 2017, www.worldbookonline.com/advanced/article?id=ar753726. (retrieved November 9, 2017).
Heinzen, James. "Corruption in the Gulag: dilemmas of officials and prisoners." Comparative Economic Studies 47, no. 2 (2005): 456+. World History in Context (accessed November 9, 2017). http://link.galegroup.com/apps/doc/A133684237/WHIC?u=seve27129&xid=e6ae5271.
Wurzer, Georg. "Lubyanka." In Encyclopedia of Russian History, edited by James R. Millar, 877-878. Vol. 2. New York: Macmillan Reference USA, 2004. World History in Context (accessed November 9, 2017).