Washington (State) University. Bureau of Governmental Research and Services. Report. s.n.
Chicago-referens (17:e uppl.)Washington (State) University. Bureau of Governmental Research and Services. Report. Seattle: s.n.
MLA-referens (9:e uppl.)Washington (State) University. Bureau of Governmental Research and Services. Report. s.n.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.