@book{102754,
	author = {Hyslop, Stephen G. and National Geographic Society (U.S.)},
	title = {Great empires :},
	publisher = {National Geographic Society,},
	year = {2011.},
	address = {Washington, D.C. :},
	url = {http://www.loc.gov/catdir/enhancements/fy1301/2012450204-b.html}
}