@book{56587,
	author = {Nelson, Michael,},
	title = {The presidency and the political system /},
	publisher = {CQ Press,},
	year = {2006.},
	address = {Washington, D.C. :},
	edition = {8th ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0514/2005015552.html}
}