Crystal, David. <br/><br/>
The cambridge encyclopedia of language. 

 - New York :  Press Syndicate ,  1997. 
 - 480 p.  ill.  28 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0521559677 
<br/><br/><label>Dewey Class. No.: </label>REF 403 CRY