@book{243,
	author = {Goff, Richard D.},
	title = {The Twentieth century :},
	publisher = {McGraw-Hill,},
	year = {2001.},
	address = {Boston :},
	edition = {6th ed.},
	url = {http://www.loc.gov/catdir/toc/mh041/2001030480.html}
}