The National Ex-Prisoner of War Association - http://prisonerofwar.freeservers.com/

Royal Air forces Escaping Society - http://www.rafinfo.org.uk/rafescape/

Royal Air Forces Ex-POW Association - http://www.rafinfo.org.uk/rafexpow/

The Great Escape Memorial Society - http://www.thegreatescapememorialproject.com/

Royal Air Forces Escaping Society Museum - http://www.rafinfo.org.uk/rafescape/rafesmus.html

Colditz Castle website
http://www.schlosscolditz.com/