Freudenthal Hans <br/><br/>
Mathematics as an educational task. 
Freudenthal Hans 
 - Dordrecht  D Reidel Publishing       1973 
 - xii,680p  cm. 
<br/><br/><label>Standard No.: </label>34148 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>T:3(B), L3