Rolston, Holmes. <br/><br/>
Environmental ethics :  duties to and values in the natural world / 
Holmes Rolston. 
 - Philadelphia :  Temple University Press,  1988. 
 - xiii, 391 p. : ill. ; 23 cm. 
 - Ethics and action .
<br/><br/> Bibliography: p. 355-374. Includes index. 
<br/><br/><label>ISBN: </label>087722501X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Human ecology--Moral and ethical aspects.