Heyd, David  . <br/><br/>
Supererogation : its status in ethical theory /  
by David Heyd. 
 - Cambridge :   Cambridge University Press ,   1982. 
 - ixx,198p :   Pictures,diagrams,maps ;   23cm .  
 - Cambridge studies in philosophy,   NULL  NULL; .
 - Cambridge studies in philosophy,   NULL  NULL; .
<br/><br/>Includes bibliography and index 
<br/><br/><label>ISBN: </label>0521239354  UKP 20.00 
<br/><br/><label>Subjects--Index Terms: </label>ETHICS 
<br/><br/><label>Dewey Class. No.: </label>170  / HEY/S