Doughty, Peter <br/><br/>
Language in use 
/ Peter Doughty, John Pearce, Geoffrey Thornton 
. - London  : Edward Arnold, 1981
. - 293 p.  ; 21 cm. 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>071311679 X 
<br/><br/><label>Source: </label> Don 
<br/><br/><label>Universal Decimal Class. No.: </label>800. 2