@book{2517,
	author = {Comins, Neil F., and Kaufmann, William J.},
	title = {Discovering the universe.},
	publisher = {W.H. Freeman,},
	year = {c2005.},
	address = {New York, NY :},
	edition = {7th ed. /},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0714/2004117132-d.html}
}