1. ADAMS, J. C. and P. BARILE (1972) The Government of Republican Italy. Boston: Houghton Mifflin.
2. ANDREN, N. (1964) Government and Politics in the Nordic Countries. Stockholm: Almquist and Wiksell.
3. AXELROD, R. (1970) Conflict of Interest. Chicago: Markham.
4. BEYME, K. von (1970) Die Parlamentarischer Regierungssysteme in Europa. Munich: Piper.
5. Party Systems and Patterns of Government in Western Democracies