Servais, W. <br/><br/>
Teaching school mathematics. 

 - Great Britain :  UNESCO,  1971. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Matemáticas
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>51