@book{4237,
	author = {Larsen, Kristine M.,},
	title = {Stephen Hawking :},
	publisher = {Prometheus Books,},
	year = {2007.},
	address = {Amherst, N.Y. :},
	edition = {Pbk. ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0726/2007036123.html}
}