@book{18249,
	author = {Grotzinger, John P. and Jordan, Thomas H.},
	title = {Understanding Earth /},
	publisher = {W.H. Freeman,},
	year = {c2010.},
	address = {New York :},
	edition = {6th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1010/2009939366-d.html}
}