Gardner, F., Montgomery, P., Fisher, & H. (2008). Opportunities Provision for Preventing Youth Gang Involvement For Children and Young People (7-16).
Chicago-referens (17:e uppl.)Gardner, F., P. Montgomery, Fisher, och H. Opportunities Provision for Preventing Youth Gang Involvement For Children and Young People (7-16). 2008.
MLA-referens (9:e uppl.)Gardner, F., et al. Opportunities Provision for Preventing Youth Gang Involvement For Children and Young People (7-16). 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.