8Campbell Augus,Philip E Converse,Warren E Miller,et al. The American Voter [ M ]. New York : Wiley, 1960:120.
9Russell J Dalton,Martin P Wattenberg. Parties without Partisans:Political Change in Advanced Industrial Democra- cies [ M ]. Oxford : Oxford University Press, 2000 : 37.
10K Knight, M Marsh. Varieties of election studies [ J ]. Election Studies, 2002(21 ).