Preston, Dennis R., <br/><br/>
Sociolinguistics and second language acquisition 
Dennis R. Preston. 
 - Oxford:  Basil Blackwell,  1989. 
 - 326 pages:  illustrations;  24 cm. 
<br/><br/>pages 288-318 
<br/><br/><label>ISBN: </label>0631152458 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language and languages--Variation.<br/>Second language acquisition.<br/>Language and languages--Study and teaching.