referendum for self-determination

More than two million people in the Spanish region of Catalonia have voted in an unofficial independence referendum.

referendum
国民投票、住民投票
発音rèfəréndəm

referendum at the local level
住民投票

referendum for self-determination
独立のための住民投票

The referendum is supposed to ask Russians if they trust their government. 
政府の信任が国民投票でロシア国民に問われることになる。