The preservation of species:  the valie of biological deversity/ 
edited by Bryan G. Norton. 
 - Princeton, N.J.:  Princeton University Press,  1986. 
 - xi, 306 p. ;   25 cm. 
<br/><br/> Written under the auspices of the center for philosophy and Public Policy, University of Maryland. 
<br/><br/>Includes index and bibliography: p. 289-296. 
<br/><br/><label>ISBN: </label>0691083894 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Wildlife conservation.<br/>Species.<br/>Extinction (Biology).