World Prison Brief: Online database providing free access to information on prison systems around the world; includes data by region.
International Incarceration Comparisons, Prison Policy Initiative
U.S. Department of State: Human Rights Reports
Countries - Prison Insider (reports and data on prison conditions in many countries).
BOOKS ON FOREIGN & INTERNATIONAL INCARCERATION ISSUES:
Women in Prison: The Bangkok Rules and Beyond, International Penal and Penitentiary Foundation (KZ7455 .W66 2017)
Prisoners of the International Community: The Legal Position of Persons Detained at International Criminal Tribunals, Denis Abels (KZ7405 .A24 2012)
Principles of European Prison Law and Policy: Penology and Human Rights, Dirk van Zyl Smit (KJC 9769 .V36 2011)
The Treatment of Prisoners Under International Law, Nigel S Rodley (K5519 .R63 2009)
Cruel and Unusual Punishment: Comparative Perspective in International Conventions, the United States and Iran, Alasti, Sanaz (K5103 .A43 2009)
Penitentiary Questions: Council Of Europe Conventions, Recommendations And Resolutions (HV9636 .P46 2009).