1. The United States in the world economy: A regional geography;Agnew,1987
2. Why parties? The origin and transformation of political parties in America;Aldrich,1995
3. Section and party: A Political geography of American Presidential Elections, from Andrew Jackson to Ronald Reagan;Archer,1981
4. Democrats are United in plans to block top Bush initiatives;Balz;The Washington Post,2005
5. In defense of the American party system;Banfield,1964