Monk, Ray.
Ludwig Wittgenstein: the duty of genius /
Ray Monk 
. - New York : Penguin Books,  1991 
. - xviii, 654 p.  ill.  23 cm. 
<br/>К.: Бібліогр. : c. 587-646, Index 
<br/><label>  ISBN: </label>0-14-015995-9 
<br/><br/><label>Subjects--Personal Names: </label><br/>Wittgenstein, Ludwig 1889-1951