1. Bennett, W. Lance, und Robert Entman. 2001. Mediated politics. Communication and the future of democracy. Cambridge: Cambridge University Press.
2. Blais, André, und Louis Massicotte. 1996. Electoral systems. In Comparing democracies. Elections and voting in global perspective, Hrsg. P. Norris, 49–81. London: SAGE Publications.
3. Bowler, Shaun, und Todd Donovan. 1998. Demanding choices: opinion, voting and direct democracy. Ann Arbor: University of Michigan Press.
4. Bowler, Shaun, Todd Donovan, und Caroline J. Tolbert. 1998. Citizens as legislators: direct democracy in the United States. Columbus: Ohio State University Press.
5. Budge, Ian, und Dennis J. Farlie. 1983. Explaining and predicting elections: issue effects and party strategies in twenty-three democracies. London: Allen & Unwin.