1. Aldenderfer, Mark S., und Roger K. Blashfield, 1984: Cluster Analysis. Sage University Paper 44. Newbury Park: Sage.
2. Cochrane, Raymond, und Michael Billig, 1990: The Political and Social Beliefs of Adolescents. S. 160–178 in: Colin Fraser und George Gaskell (Hg.), The Social Psychological Study of Widespread Beliefs. Oxford: Clarendon Press.
3. Dalton, Russell J., 1984: Cognitive Mobilization and Partisan Dealignment in Advanced Industrial Democracies. The Journal of Politics 46: 264–284.
4. Eckstein, Harry, 1988: A Cultural Theory of Political Change. American Political Science Review 83/3: 789–804.
5. Everitt, Brian S., Sabine Landau und Morven Leese, 2001: Cluster Analysis. London: Arnold.