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Getty, J.; Rittersporn, T.; Zemskov, V. (1993). "Victims of the Soviet Penal System in the Pre-War Years: A First Approach on the Basis of Archival Evidence". The American Historical Review. 98 (4): 1017–1049. doi:10.2307/2166597. JSTOR2166597.
Adamson, Christopher (1983). "Punishment after Slavery: Southern State Penal Systems, 1865–1890". Social Problems. 30 (5): 555–569. doi:10.2307/800272. JSTOR800272.
Guilbaud, Fabrice (2010). "Working in Prison: Time as Experienced by Inmates-Workers". Revue Française de Sociologie. 51 (5): 41–68. doi:10.3917/rfs.515.0041. JSTOR40731128.
Wood, Phillip J. (1 September 2007). "Globalization and Prison Privatization: Why Are Most of the World's For-Profit Adult Prisons to Be Found in the American South?". International Political Sociology. 1 (3): 222–239. doi:10.1111/j.1749-5687.2007.00015.x. ISSN1749-5687.
Getty, J.; Rittersporn, T.; Zemskov, V. (1993). "Victims of the Soviet Penal System in the Pre-War Years: A First Approach on the Basis of Archival Evidence". The American Historical Review. 98 (4): 1017–1049. doi:10.2307/2166597. JSTOR2166597.
Adamson, Christopher (1983). "Punishment after Slavery: Southern State Penal Systems, 1865–1890". Social Problems. 30 (5): 555–569. doi:10.2307/800272. JSTOR800272.
Guilbaud, Fabrice (2010). "Working in Prison: Time as Experienced by Inmates-Workers". Revue Française de Sociologie. 51 (5): 41–68. doi:10.3917/rfs.515.0041. JSTOR40731128.
justice.gov.uk
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Cameron, David (24 May 2005). "A message from the PM". ONE3ONE Solutions. Retrieved 10 August 2012.
"Political Prison Camps in North Korea Today"(PDF), Database Center for North Korean Human Rights, pp. 406–428, 15 July 2011, archived from the original(PDF) on 28 February 2013, retrieved 7 February 2014 Chapter 4 Current Status of Compulsory Labor
"Political Prison Camps in North Korea Today"(PDF), Database Center for North Korean Human Rights, pp. 406–428, 15 July 2011, archived from the original(PDF) on 28 February 2013, retrieved 7 February 2014 Chapter 4 Current Status of Compulsory Labor
Wood, Phillip J. (1 September 2007). "Globalization and Prison Privatization: Why Are Most of the World's For-Profit Adult Prisons to Be Found in the American South?". International Political Sociology. 1 (3): 222–239. doi:10.1111/j.1749-5687.2007.00015.x. ISSN1749-5687.