Townsend, Colin R. <br/><br/>
Essentials of ecology / 
Colin R. Townsend, Michael Begon, John L. Harper. 
 - 3a ed. 
 - Malden, Mass. :  Blackwell Scientific Publications,  2008. 
 - xi, 510 p. 
<br/><br/><label>ISBN: </label>978-1-4051-5658-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecología.
<br/><br/><label>Dewey Class. No.: </label>574.5  / T655e