Freudenthal, Hans,  1905- <br/><br/>
Mathematics as an educational task / 
by Hans Freudenthal. 
 - Dordrecht :  D. Reidel Publishing Company,  1973. 
 - 680 p. :  ill. ;  23 cm. 
<br/><br/>Bibliography : p.(678)-680. 
<br/><br/><label>ISBN: </label>9027702357 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching.<br/>Mathematics--Philosophy.