Are US prisons too comfortable? If only selected of the circumstances inherent in punishment are present, it is generally not regarded as a situation in which it would be precise to use the word "punishment". The Crisis of Imprisonment: Protest, Politics, and the Making of the American Penal State, 1776-1941 (Cambridge Historical Studies in American Law and Society)
US & World Population Clock. U.S. Census Bureau.
Arizona Inmates Back on the Net. Wired News. 2002. Retrieved 2008-01-26.
Prisoners’ Rights – Legal Correspondence. FindLaw. Retrieved 2008-01-26.
Aging inmates clogging nation's prisons. Associated Press. September 30, 2007
Aday, Ronald H. (2003). Aging Prisoners: Crisis in American Corrections. Praeger. ISBN 0275971236
One in 100: Behind Bars in America 2008. Released Feb. 28, 2008. The Pew Center on the States.
Prisoners in 2008. (NCJ 228417). December 2009 report from the U.S. Bureau of Justice Statistics. By William J. Sabol, Ph.D. and Heather C. West, Ph.D., BJS Statisticians. Also, Matthew Cooper, BJS Intern. Table 9 on page 8 of the PDF file has the number of inmates in state or federal public prison facilities, local jails, U.S. territories, military facilities, U.S. Immigration and Customs Enforcement (ICE) owned and contracted facilities, jails in Indian country, and juvenile facilities. Table 8 on page 8 has the incarceration rates for 2000, 2007, and 2008.