This is a five minute version of the cathedral scene.
This version was adapted for film by the famous writer Graham Greene.
Check out the Catholic version of Joan's life.
Here's the entire text of Shaw's play for free. It includes his amazing preface.
These are the transcripts of Joan's actual trial straight from the 1400s.
Here's a website dedicated to everything Joan.
This site provides some good historical background.
This site provides a good overview of the Hundred Years War.