Wardhaugh, Ronald. <br/><br/>
Introduction to linguistics 
Ronald Wardhaugh 
 - 2. ed. 
 - New York  McGraw-Hill Book Company  1977 
 - 268 p. 
<br/><br/>Bibliography : p. 255-261 Includes index 
<br/><br/><label>ISBN: </label>0070681503 
<br/><br/><label>LCCN: </label>70168458  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linguistics