EINSTEIN(Albert) <br/><br/>
"The collected papers of Albert Einstein. Vol 9: The Berlin years:correspondence, January 1919 - April 1920 (ORIGINAL)" 

 - Princeton  Princeton University Press  2004 
 - Hbk.lxxiii p. + 697 
<br/><br/><label>ISBN: </label>0691120889 
<br/><br/><label>Source: </label>8102