Smith, Robert Leo. <br/><br/>
Elements of ecology / 
Robert Leo Smith. 
 - 3rd ed. 
 - New York :  HarperCollins Publishers,  c1992. 
 - xvii, 617, [30] p. :  ill. (some col.) ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0060463287 (pbk. ) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.