Crystal, David . <br/><br/>
Cambridge encyclopedia of language /   Textual Documents 
David Crystal. 
 - Cambridge :   Cambrdge University Press ,   1987. 
 - NULL ;   NULL. 
<br/><br/><label>Subjects--Index Terms: </label>Language Encyclopedia 
<br/><br/><label>Dewey Class. No.: </label>403  / CRY