Classroom oriented research in second language acquisition, 
Herbert W. Seliger and Michael H Long. 
 - London:  Rowley,  1983. 
 - ix,305p.:  ill.;  24 cm 
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0883772671 
<br/><br/><label>LC Class. No.: </label>DUCE P51.C56