The book of all the papers accepted for presentation at ICMI Study 19 conference, held on May 10-15, 2009, at National Taiwan Normal University in Taipei, Taiwan, can now be downloaded from the Study website. 

The reference for this book is:
Fou-Lai Lin, Feng-Jui Hsieh, Gila Hanna and Michael de Villiers, eds. Proof and Proving in Mathematics Education: ICMI Study 19 Conference Proceedings.  (2 volumes)  Department of Mathematics, National Taiwan Normal University, 2009.