No Escape. Male Rape in U.S. Prisons. Human Rights Watch undertook three years of research to expose the problem of male rape in U.S. prisons. The resulting 378-page report is based on information from over 200 prisoners spread among thirty-four states, some of whom were interviewed personally, as well as an exhaustive survey of state prison authorities.
Global Bibliography of Prison Systems - this bibliography provides a reasonably comprehensive source for identifying information written about the prison system in as many countries of the world as possible.