Gumperz John J. <br/><br/>
Directions in sociolinguistics : The ethnography of communication 

 - New York, USA  Basil Blackwell Limited  1986 
 - x,597p. 
<br/><br/><label>ISBN: </label>0-631-14986-4 
<br/><br/><label>Source: </label>Textual