Hanna G. <br/><br/>
Proof and proving in mathematics the 19th ICMI  study/ 
Gila Hanna and Michael de Villiers 
 - London:  Springer,  2012. 
 - xii, 475p.:  ill.;  24 cm. 
<br/><br/> includes bibliography references and index 
<br/><br/><label>ISBN: </label>9789400721289 
<br/><br/><label>LC Class. No.: </label>DUCE QA14.C3H36