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1. Davidson, James West. Nation of nations: a narrative history of the American republic. – New York: McGraw-Hill, Inc., 1990.
2. DiClerico, Robert E., Hammock, Allan S. Points of view: reading in American government and politics. – New York: Random House, Inc., 1989.
3. Holmes, Jack E. American government: essentials and perspectives. – New York: McGraw-Hill, Inc., 1991.
4. Maisel, Louis Sandy. Parties and elections in America: the electoral process. – New York: McGraw-Hill, Inc., 1993.
5. Patterson, Thomas. The American Democracy. – New York: McGraw-Hill, Inc., 1993.
6. The World Book Encyclopedia. Volume 6: E – Chicago; London; Sydney; Toronto: World Book, Inc., 1995.
7. The World Book Encyclopedia. Volume 15: P – Chicago; London; Sydney; Toronto: World Book, Inc., 1995
8. http:// en. wikipedia. org
9. http:// www. betterworldlinks. org
10. http:// www. britannica. com
11. http:// www. enchantedlearning. com