- Parties and Democracy: Coalition Formation and Government Functioning in Twenty States (Comparative European Politics)
- Mapping Policy Preferences: Estimates for Parties, Electors, and Governments 1945-1998
- The New Challenge of Direct Democracy
- Organizing Democratic Choice: Party Representation Over Time
- Handbook of Democratic Government: Party Government in 20 Democracies (1945-1990) (1945-1990)