↑Carmines, Edward G., and Geoffrey C. Layman. 1997. "Issue Evolution in Postwar American Politics." In Byron Shafer, ed., Present Discontents. NJ:Chatham House Publishers.
↑[1] Cynthia Kaufman Ideas For Action: Relevant Theory For Radical Change
↑ Todd Gitlin, "The Left's Lost Universalism". In Arthur M. Melzer, Jerry Weinberger and M. Richard Zinman, eds., Politics at the Turn of the Century, pp. 3–26 (Lanham, MD: Rowman & Littlefield, 2001).