The Cambridge companion to PLATO / 
edited by Richard Kraut 
 - Cambridge :  Cambridge Univ.Press,  c1992. 
 - xiV, 560 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>0521430186 
<br/><br/><label>LCCN: </label>
<br/><br/><label>LC Class. No.: </label>B395  / .C28 1992