Crystal, David. <br/><br/>
Who cares about english usage? /  

 - 1st ed /  
 - England :   Penguin Books Ltd. ,   1984 
 - p.123 :  
<br/><br/><label>ISBN: </label>0-14-02.2544-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linguistics
<br/><br/><label>Dewey Class. No.: </label>P111  / M4