van Ek, J A <br/><br/>
Threshold 1990 
J A van Ek ; J L M Trim 
 - Cambridge  Cambridge University Press  c1991 
 - v, 184 p. ; 23 cm 
<br/><br/><label>ISBN: </label>9780521567060 
<br/><br/><label>Subjects--Topical Terms: </label><br/>applied linguistics
<br/><br/><label>Dewey Class. No.: </label>418.00704 EK