My therapist and I do relaxation visualizations during therapy sessions and we have recorded a few of them on to cassettes so that I can listen to them any time I need them. Some of them are from Belleruth Naparstak and you can listen to samples on her (Belleruth Naparstak) website at
http://www.healthjourneys.com
I also use The courage to Heal Textbook and workbook both by Laura Davis. You can find them in bookstores and on her website at http://
www.lauradavis.net They have great information and activities to do when triggered and experiencing flashbacks,
I also use the daily practices and meditations by Nancy J Napier. You can find that information on her website
http://www.nancyjnapier.com