Ridley, Matt. <br/><br/>
The origin of virtue. 

 - London :  Penguin books,  1997. 
 - 295 p. 
<br/><br/><label>ISBN: </label>9780140244045  1120 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Altruism.<br/>Genetic factor.<br/>Social behaviour.
<br/><br/><label>Dewey Class. No.: </label>304.5  / RID-o