Seliger, Herbert W. <br/><br/>
Second language research methods 
/ Herbert W. Seliger, Elena Shomamy 
. - Oxford  : Oxford University press, C. 1989
. - V-270p.  ; 22Cm. 
<br/><br/>Bibliogr. Index 
<br/><br/><label>ISBN: </label>0194370674 
<br/><br/><label>Universal Decimal Class. No.: </label>001.891.