The world book encyclopedia.  

 - London :  World Book,  c 1989. 
 - Vols. :  ill. ;  25 cm. 
<br/><br/>V. 21- W-X-Y-Z ; 
<br/><br/>42  42 
<br/><br/><label>ISBN: </label>0-7166-0098-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Encyclopedias--Dictionaries.
<br/><br/><label>Dewey Class. No.: </label>031 / W893