Aldrich, J. H., & Freeze, M. (2009). Political Participation, Polarization, and Public Opinion: Activism and the Merging of Partisan and Ideological Polarization. In B. Highton & P. Sniderman (Eds.), Facing the Challenge of Democracy: Explorations in the Analysis of Public Opinion and Political Participation. Princeton University Press.

Aldrich, J. H., and Melanie Freeze. “Political Participation, Polarization, and Public Opinion: Activism and the Merging of Partisan and Ideological Polarization.” In Facing the Challenge of Democracy: Explorations in the Analysis of Public Opinion and Political Participation, edited by Ben Highton and Paul Sniderman. Princeton University Press, 2009.

Aldrich JH, Freeze M. Political Participation, Polarization, and Public Opinion: Activism and the Merging of Partisan and Ideological Polarization. In: Highton B, Sniderman P, editors. Facing the Challenge of Democracy: Explorations in the Analysis of Public Opinion and Political Participation. Princeton University Press; 2009.

Aldrich, J. H., and Melanie Freeze. “Political Participation, Polarization, and Public Opinion: Activism and the Merging of Partisan and Ideological Polarization.” Facing the Challenge of Democracy: Explorations in the Analysis of Public Opinion and Political Participation, edited by Ben Highton and Paul Sniderman, Princeton University Press, 2009.

Aldrich JH, Freeze M. Political Participation, Polarization, and Public Opinion: Activism and the Merging of Partisan and Ideological Polarization. In: Highton B, Sniderman P, editors. Facing the Challenge of Democracy: Explorations in the Analysis of Public Opinion and Political Participation. Princeton University Press; 2009.