AmentaEdwin. 2006. When Movements Matter: The Townsend Plan and the Rise of Social Security. Princeton, NJ: Princeton University Press.
2.
GiugniMarco. 2004. Social Protest and Policy Change: Ecology, Antinuclear, and Peace Movements in Comparative Perspective. New York: Rowman & Littlefield.
3.
GoldstoneJack A., ed. 2003. States, Parties, and Social Movements. Cambridge, UK: Cambridge University Press.
4.
KeyV. O.1942. Politics, Parties, and Pressure Groups. New York: Thomas Y. Crowell.
5.
LipskyMichael. 1968. “Protest as a Political Resource.” American Political Science Review62:1144–1158.
6.
McAdamDougTarrowSidney. 2010. “Ballots and Barricades: On the Reciprocal Relationship between Elections and Social Movements. Perspectives on Politics8(2):529–42.