Martin Gitlin 
Cómo ayudar a un amigo en una relación abusiva (Helping a Friend in an Abusive Relationship) [PDF ebook] 

A teen is trapped in an abusive relationship, and a friend wants to help. This comprehensive book shares how to spot the warning signs of an abusive relationship, how to be supportive of a friend who needs help, and what kind of resources are available to both the helper and the victim. It may be scary to deal with a friend in an abusive situation, but this informative guide will be a strong tool in letting readers know how practical ways that they can navigate a difficult situation and give their much-needed support.