Begle, E. G <br/><br/>
Critical variables in mathematics education  findings from a sutvey of the empirical literature 
E. G. Begle 
 - New York  NCTM  1979 
 - XV, 185 p  25 cm 
<br/><br/> Contine bibliografie 
<br/><br/><label>ISBN: </label>0883854309