1Maurice Duverger. Political Parties [D] . University Paperbacks, Mathuen & Co. Ltd, London, 1964.
2E. E. Schattschneider. Party Government [M] . New York : Cambridge University, 1942.
3Robert A. Dahl. Pluralist Democracy in the United States : Conflict and Consent [M] . Chicago : Rand McNally, 1967.
4Maurice Duverger. Duverger's Law: Forty Years Later [A] . Bernard Grofman and Arend Lijphard. Electoral Laws and Their Political Consequences [M] . New York: Agathon Press, 1986.
5Rae, Douglas W. The Political Consequences of Electoral Laws (RevEd) [M] . Conn: Yale University Press. 1971.
6Grumm, J.G. Theories of Electoral Systems [J] . Midwest Journal of Political Science, 1958, (2) : 357-376.
7Sartori, Giovanni. Parties and Party Systems: A Framework for Analysis [M] . Cambridge University Press , 1976.