Leakey, Richard  <br/><br/>
The sixth extinction :  biodiversity and its survival / 
Richard Leakey and Roger Lewin. 
 - London :  Phoenix,  1998. 
 - 254 p. ;  il. ;  24 cm. 
<br/><br/><br/>Inglés 
<br/><br/><label>ISBN: </label>1857994736 
<br/><br/><label>Subjects--Index Terms: </label>Evolution Evolución 
<br/><br/><label>Dewey Class. No.: </label>576.84