There are many resources to help in identifying and intervening effectively to stop bulling and its consequences. Here are some.
Bullying Prevention for Schools: A Step-by-Step Guide to Implementing a Successful Bullying Prevention Program, by Allan L. Beane.
"Understanding Bullying: From Research to Practice," by W.M Craig and D.J. Pepler. Canadian Psychology, Vol 48 (2007), Pages 86-93.
Bullying Prevention: Creating a Positive School Climate and Developing Social Competence, by Pamela Orpinas and Arthur M. Horne.
Children and Bullying: How Parents and Educators Can Reduce Bullying at School, by Ken Rigby.