Hughes Eryl Rothwell <br/><br/>
Conceptual powers of children : An approach through mathematics and science 

 - London, UK  Macmillan Education Ltd.  1979 
 - xi,260p. 
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child Psychology