Margot Sunderland 
Helping Children who have hardened their hearts or become bullies [PDF ebook] 
A Guidebook

This is a guidebook to help children who: – bully or take revenge on others for the pain they have felt themselves – have become very defensive because something too painful has happened to them – have hardened their hearts because they have: been too hurt in love; met with too much harshness; witnessed parental violence; been repeatedly hit; been shamed or humiliated; or – had too many experiences of not being responded to – think they have lost their parent’s love to someone else and have hardened their heart.