Wardhaugh, Ronald. <br/><br/>
An introduction to sociolinguistics / 
Ronald Wardhaugh. 
 - 5th ed. 
 - Malden, Mass., USA :  Blackwell Pub.,  2006. 
 - 418 p. ;  25 cm. 
<br/><br/>Includes bibliographical references (p. [385]-414) and index. 
<br/><br/><label>LCCN: </label>2005-019312 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sociolinguistics.<br/>Ngôn ngữ học<br/>Ngôn ngữ học xã hội<br/>Sociology.
<br/><br/><label>LC Class. No.: </label>P40  / .W27 2006 
<br/><br/><label>Dewey Class. No.: </label>306.44  / WAR 2006