Whitney, Norman <br/><br/>
Open doors  student's book 1 
Norman Whitney 
 - 8th ed. 
 - Oxford  Oxford University Press  1997 
 - 118 p.  29 cm. 
<br/><br/><label>ISBN: </label>0194356000 
<br/><br/><label>Dewey Class. No.: </label>428 WHI