Singer, Peter <br/><br/>
The Expanding circle :  ethics and sociobiology / 
By Peter Singer 
 - Oxford :  Clarendon Press,  1981 
 - 190 p. ;  22 cm. 
<br/><br/>Includes bibliographies and index 
<br/><br/><label>ISBN: </label>0192830384 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ethics<br/>Sociobiology