Zeilik,Michael <br/><br/>
Astronomy:  The Evolving Universe / 
by Michael Zelik 
 - 8th Ed. 
 - New York:  John Wiley and Sons,  1997 
 - p.521 
<br/><br/><label>ISBN: </label>0471135666 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy<br/>Astronomy and allied sciences
<br/><br/><label>Dewey Class. No.: </label>520  / ZEI-A 8