Washington (State) University. Bureau of Governmental Research and Services. Report. s.n.
Citazione stile Chigago Style (17a edizione)Washington (State) University. Bureau of Governmental Research and Services. Report. Seattle: s.n.
Citatione MLA (9a ed.)Washington (State) University. Bureau of Governmental Research and Services. Report. s.n.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.