Wardhaugh, Ronald. <br/><br/>
An Introduction to sociolinguistics / 
Ronald Wardhaugh. 
 - 6th  ed. 
 - Oxford :  Wiley-Blackwell,  2010. 
 - viii, 450  p. 
<br/><br/><label>ISBN: </label>1405186681 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sociolinguistics.