Verma,P.S., <br/><br/>
Principles of Ecology 

 - 3rd /   1986. 
 - N.Delhi:  S.Chand & Company Ltd,  1986. 
 - 591 p. 
<br/><br/><label>Subjects--Personal Names: </label><br/>Zoology, Ecology. 
<br/><br/><label>Dewey Class. No.: </label>574.5