UNCRC
ARTICLE 40: Administration of Juvenile Justice;
ARTICLE 3: Best Interests of the Child
Some search suggestions to use in SOLO to get you started:
Criminal liability
Age law
Juvenile delinquency
Juvenile delinquents -- Rehabilitation
Juvenile delinquents -- Services for
Social work with juvenile delinquents
Juvenile justice, Administration of
Juvenile offenders
Juvenile corrections
Juvenile recidivists
Children's Rights and the Minimum Age of Criminal Responsibility by 
The Handbook of Juvenile Delinquency and Juvenile Justice by Suggested SOLO subject searches:
Juvenile delinquency -- Prevention
Juvenile delinquents -- Rehabilitation
Gang prevention
Peer pressure
Evidence-Based Skills in Criminal Justice : international research on supporting rehabilitation and desistance by 
Why Children Follow Rules : legal socialization and the development of legitimacy by Rook & Ward on Sexual Offences - holders of an Oxford SSO can access current edition via our Westlaw UK subscription.
Children's Views and Evidence by 