One more resource you should have a look at is the very recent book Leaving terrorism behind.

This excellent collection of essays is edited by Tore Bjorgo, and it covers both individuals and collective processes of disengagement from terrorism. The book is (partly) available through Google Books here. You can also buy it online here. I especially recommend you have a look at Part II (pp. 133-242), which has overviews of several de-radicalisation/de-mobilisation/rehabilitation programs – including the Barrett & Bokhari study I have linked to in my previous post.

Happy readings!