There is an article in this subject but it's going to need to be dug out of this term paper. The author does provide some information about the debates in 1960, 1976, and 2004. But there should also be information about other Presidential debates; the pre-nomination debates between the candidates of each party; the format of the debates and the organizations that run them; the impact of the debates on the campaigns; and the presense or absense of third party candidates.