1. Aldrich, John H. 1995. Why parties? The origin and transformation of political parties in America. Chicago: University of Chicago Press.
2. Bartels, Larry M. 2000. Partisanship and Voting Behavior, 1952–1996. American Journal of Political Science 44(1): 35–50.
3. Bernstein, Jonathan. 1999. The expanded party in American politics. Unveröffentlichtes Manuskript, University of Berkeley.
4. Bishop, Bill. 2008. The big sort – Why the clustering of like-minded America is tearing us apart. New York: Houghton Mifflin Company.
5. Black, Earl, und Merle Black. 2003. The rise of southern republicans, 2. Aufl. Cambridge, MA: Harvard University Press.