Wardhaugh, Ronald. <br/><br/>
Introduction to Sociolinguistics /  

 - 1st ed /  
 - Oxford OX4 1JF :   Basil Blackwell Ltd.. 
 - p.383 :  
<br/><br/><label>ISBN: </label>0-631-14272-X 
<br/><br/><label>Dewey Class. No.: </label>P0bY  / M6