Crystal, David. <br/><br/>
The Cambridge Encyclopedia of The English Language /  

 - 1st ed /  
 - Cambridge CB2 1RP :   Cambridge University Press ,   1997 
 - p489 :  
<br/><br/><label>ISBN: </label>0-521-40179-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linguistics
<br/><br/><label>Dewey Class. No.: </label>P111K  / N5