Cass R. Sunstein, Infotopia: How Many Minds Produce Knowledge (New York: Oxford University Press, 2006), p. 188.
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Eric Lawrence, John Side, and Henry Farrell, “Self-Segregation or Deliberation? Blog Readership, Participation, and Polarization in American Politics”, Department of Political Science, George Washington University, March 10, 2009, http://projects.iq.harvard.edu/cces/fles/ Lawrence_Sides_Farrell_Self-Segregation_or_Deliberation.pdf
