Einstein, Albert. <br/><br/>
The collected papers of albert einstein.  the berlin years :  writings, 1914-1917 /  Volume  6 : 
Albert Einstein, Alfred Engel. 
 - [S.l.] :  Princeton University Press,  1997. 
 - 464 p. ;  25 cm. 
<br/><br/><label>ISBN: </label>0691017344 9780691017341 
<br/><br/><label>Dewey Class. No.: </label>530