1. The Responsible Electorate by V. O. Key, Jr. (Cambridge: Harvard University Press, 1966).
2. The American Party Systems edited by William N. Chambers and Walter Dean Durnham (New York: Oxford University Press, 1967).
3. The End of Liberalism by Theodore J. Lowi (New York: W. W. Norton & Co., Inc., 1969).
4. Congressmen and the Electorate by Milton R. Cummings (New York: The Free Press, 1967). A more extensive treatment of these issues are to be published next year by W. W. Norton & Co., Inc. The tentative title:Critical Elections and the Future of American Politics.