Townsend, Colin R. <br/><br/>
Essentials of ecology / 
Colin R. Townsend, Michael Begon, John L. Harper. 
 - 2nd ed. 
 - Malden, MA :  Blackwell ,  2003. 
 - xiii, 530 p. :  ill.(chiefly col.) ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>1405103280 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.