The world book encyclopedia  vol. 20 
World Book, inc.                                             
 - London  World Book  1993 
 - 430p. 
<br/><br/><label>ISBN: </label>0-7166-6693-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and Astrophysics Thesaurus
<br/><br/><label>Universal Decimal Class. No.: </label>03  / WBE-20