Sunstein, Cass2013-12-052007Cass R. Sunstein, Ideological Amplification, 14 Constellations 273 (2007).1351-0487http://nrs.harvard.edu/urn-3:HUL.InstRepos:11354037en-USIdeological AmplificationJournal Article10.1111/j.1467-8675.2007.00439.x/pdf