Wardhaugh, Ronald <br/><br/>
An introduction to sociolinguistics/ 
Ronald Wardhaugh and Janet M. Fuller 
 - Seventh Edition ; 
 - Chichester, West Sussex:  Wiley-Blackwell,   c2015. 
 - xvii, 427 pages :  photos ;  25 cm. 
<br/><br/>Includes bibliographical references, glossary and index<br/>