Coppen, Helen <br/><br/>
Aids to teaching and learning / 
Helen Coppen 
 - Oxford :  Pergamon Press,  1969 
 - 230 p. :  ill. ;  20 cm. 
<br/><br/>Bibliography: p.225-230 
<br/><br/><label>ISBN: </label>0080129048 
<br/><br/><label>LCCN: </label>68-9151 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching--Aids and devices