I would recommend the blog talk radio that I put on the aces in peds group from Dr. Bruce Perry who discusses how to deal with these kid. Also the Foster Care AAP pdf has a section in the last pages about signs/symptoms kids can present with and how to respond to them. With these kids sensitivity is the key. Anything negative - a small look, a tone of voice that suggests even the slightest possibility of disappointment in the child can produce internal feelings of "I am terrible, I should have never been born, I am worthless, I am unloved" and can produce extreme outbursts or dissociation and disengagement. Also the National Child Traumatic Stress Network has lots of stuff that is always useful. You have to join but everything is available free of cost. But it truly is like emotionally, many of these kids can seem as if "they lack skin" because anything can hurt them. A touch that would be loving to you or I may trigger an intense re-experience of a forceful blow or slap across the cheek. The entire brain system is wired to detect threat and there is a negative bias to see threat.