Schopenhauer, Arthur 1788-1860.
On the fourfold root of the principle of sufficient reason /
Arthur Schopenhauer ; translated from the German by E.F.J. Payne with an introduction by Richard Taylor 
. - La Salle : Open Court,  1974 
. - xxx, 260 p.  20 cm. 
 - (The Open Court library of philosophy )
<br/>К.: Бібліогр. : c. 257-260, Index 
<br/><label>  ISBN: </label>0-87548-187-6