Singer, Peter,  1946- <br/><br/>
The Expanding circle  ethics and sociobiology / 
By Peter Singer 
 - Oxford :  Oxford University Press,  1983 
 - 190 p. ;  20 cm. 
<br/><br/><label>ISBN: </label>0192830384 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ethics<br/>Sociobiology