Tavares, Antonio F.; Camoes, Pedro J. (2007). "Local service delivery choices in Portugal: A political transaction costs network". Local Government Studies33 (4): 535–553. doi:10.1080/03003930701417544.
Grossi, G.; Reichard, C. (2008). "Municipal corporatization in Germany and Italy". Public Management Review10 (5): 597–617. doi:10.1080/14719030802264275.