Heimlich, Russell. "Independents Oppose Party in Power ... Again." Pew Research Center for the People and the Press, 23 Sept. 2010, www.people-press.org/2010/09/23/independents-oppose-party-in-power-again/.
Maisel, L. Sandy. American Political Parties and Elections: A Very Short Introduction. New York, Oxford University Press, 2016.
Oliphant, Baxter. "The Public, the Political System and American Democracy." Pew Research Center for the People and the Press, 26 Apr. 2018, www.people-press.org/2018/04/26/the-public-the-political-system-and-american-democracy/.