@book{17558,
	author = {Levin, Harold L.},
	title = {The earth through time /},
	publisher = {J. Wiley,},
	year = {c2006.},
	address = {Hoboken, N.J. :},
	edition = {8th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0645/2006271484-d.html}
}