Hattie, John A. C. <br/><br/>
Visible Learning :  A synthesis of over 800 meta-analyses relating to achievement 
John A. C. Hattie 
 - First publ. 
 - New York  Routledge  2009 
 - 378 S. 
<br/><br/><label>ISBN: </label>9780415476188  35,80 € 
<br/><br/><label>Subjects--Index Terms: </label>e-learning