@book{39897,
	author = {Zeilik, Michael. and Gregory, Stephen A.},
	title = {Introductory astronomy & astrophysics /},
	publisher = {Saunders College Pub.,},
	year = {c1998.},
	series = {Saunders golden sunburst series},
	address = {Fort Worth :},
	edition = {4th ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy1401/97069268-t.html}
}