@book{2509,
	author = {Comins, Neil F., and Kaufmann, William J.},
	title = {Discovering the universe.},
	publisher = {W.H. Freeman,},
	year = {c2008.},
	address = {New York :},
	edition = {8th ed. /},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0834/2007939343-d.html}
}