Roberts, P. W. Regional policy: The European perspective : a review article. Town Planning Review.
Chicago-viite (17. p.)Roberts, Peter W. "Regional Policy: The European Perspective : A Review Article." Town Planning Review .
MLA-viite (9. p.)Roberts, Peter W. "Regional Policy: The European Perspective : A Review Article." Town Planning Review, .
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.