Columbia subject headings:
Juvenile delinquency--United States.
Harvard subject headings:
Criminal behavior, Prediction of--Pennsylvania--Philadelphia.
Fear of crime--Pennsylvania--Philadelphia.
Gangs--Pennsylvania--Philadelphia.
Juvenile delinquency--Pennsylvania--Philadelphia.
Victims of crimes--Pennsylvania--Philadelphia.
Princeton subject headings:
Criminal behavior, Prediction of--Pennsylvania--Philadelphia.
Fear of crime--Pennsylvania--Philadelphia.
Gangs--Pennsylvania--Philadelphia.
Juvenile delinquency--Pennsylvania--Philadelphia.
Victims of crimes--Pennsylvania--Philadelphia.