Ecology :   the experimental analysis of distribution and abundance /  
Charles J Krebs 
 - 3a. ed. 
 - EEUU :  Harper & Row,  1985 
 - 800 p. :    800 p. ; fig. ;    22 cm. 
<br/><br/><label>ISBN: </label>6437782 
<br/><br/><label>LC Class. No.: </label> / K 73 
<br/><br/><label>Universal Decimal Class. No.: </label>574.5