Chandler, David: Voices from S-21. Terror and history inside Pol Pot's secret prison. University of California Press, 1999. ISBN0-520-22247-4 (A general account of S-21 drawing heavily from the documentation maintained by the prison's staff.)
Stephen Heder with Brian D. Tittemore, Seven Candidates for Prosecution: Accountability for the Crimes of the Khmer Rouge, War Crimes Research Office, Washington College of Law, American University, and Documentation Center of Cambodia. July 2001
