@book{88206,
	author = {Roskin, Michael and Berry, Nicholas O.},
	title = {IR  The new world of international relations},
	publisher = {Pearson/Prentice Hall},
	year = {c2005},
	address = {Upper Saddle River (Nueva Jersey, Estados Unidos)},
	edition = {6th ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0419/2004015062.html}
}