Fiorina, Morris P.; Abrams, Samuel J. Political Polarization in the American Public. Annual Review of Political Science. 1 June 2008, 11 (1): 563–588. doi:10.1146/annurev.polisci.11.053106.153836.
McCoy, Jennifer; Rahman, Tahmina; Somer, Murat. Polarization and the Global Crisis of Democracy: Common Patterns, Dynamics, and Pernicious Consequences for Democratic Polities. American Behavioral Scientist. January 2018, 62 (1): 16–42. ISSN 0002-7642. doi:10.1177/0002764218759576.
McCoy, Jennifer; Rahman, Tahmina; Somer, Murat. Polarization and the Global Crisis of Democracy: Common Patterns, Dynamics, and Pernicious Consequences for Democratic Polities. American Behavioral Scientist. January 2018, 62 (1): 16–42. ISSN 0002-7642. doi:10.1177/0002764218759576.