- The official web site of the historic Eastern State Penitentiary Historic Site and Museum located in Philadelphia, PA. The Museum is open for tours and provides extensive information on prison history and prison reform and is a national historic landmark.www.easternstate.org
- Article by Mike Walsh about the historic Eastern State Penitentiary in Philadelphia, a Quaker prison built in the early 19th century. Sponsored by mission creep online publishing.www.missioncreep.com/mw/estate.html