Wittgenstein, Ludwig. <br/><br/>
On certainty   
by Ludwig Wittgenstein 
 - Oxford  Basil Blackwell  1974 
 - Sectional. 
<br/><br/><label>ISBN: </label>0 631 12000 9 
<br/><br/><label>LCCN: </label>69-20428 
<br/><br/><label>Dewey Class. No.: </label>193  / N74