Walker, James A. <br/><br/>
Variation in linguistic systems / 

 - N,Y, :   Routledge,   c2010. 
 - xviii,   158 p. : ill. ;   23 cm. 
<br/><br/>Includes bibliographical references & index. 
<br/><br/><label>ISBN: </label>9780415990684 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1. Language and Languages- Variation.
<br/><br/><label>Dewey Class. No.: </label>Circ. 417.7 W181v 2010