@book{31480,
	author = {Laet, Sigfried J. de. and International Commission for a History of the Scientific and Cultural Development of Mankind.},
	title = {History of humanity /},
	publisher = {Routledge ;},
	year = {1994},
	address = {London ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0648/94231900-d.html}
}