1. Devolution in the United Kingdom;Bogdanor,1999
2. Making Votes Count: Strategic Coordination in the World’s Electoral Systems;Cox,1997
3. Coalition Government: Subnational Style: Multiparty Politics in Europe’s Regional Parliaments;Downs,1998
4. Political Parties;Duverger,1954
5. Proportionality, disproportionality and electoral systems;Gallagher;Electoral Studies,1991