1. BLONDEL, J. (1969) An Introduction to Comparative Government. London: Weidenfeld & Nicolson.
2. DAHL, R. A. (1971) Polyarchy: Participation and Opposition. New Haven: Yale Univ. Press.
3. DEUTSCH, K. W., S. A. BURRELL, R. A. KANN, M. LEE., Jr., M. LICHTERMAN, R. E. LINDGREN, F. L. LOEWENHEIM and R. W. VAN WAGENEN (1957) Political Community and the North Atlantic Area: International Organization in the Light of Historical Experience. Princeton: Princeton Univ. Press.
4. DUVERGER, M. (1963) Political Parties: Their Organization and Activity in the Modern State. New York: John Wiley.
5. Social Anthropology and the Method of Controlled Comparison