Teaching school mathematics 
edited by W. Servais and T. Varga 
 - Harmondsworth  Penguin  1971 
 - 308p illus(some col) ;  21cm Pbk 
<br/><br/> 'A Unesco Source book' 
<br/><br/><label>ISBN: </label>0140800840 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Secondary)