Verma, P.S, <br/><br/>
Environmental Biology 

 - 1st /   1998. 
 - N.Delhi:  S.Chand & Company,  1998. 
 - 591 p. 
<br/><br/><label>ISBN: </label>8121908590 
<br/><br/><label>Subjects--Personal Names: </label><br/>Zoology, Biology. 
<br/><br/><label>Dewey Class. No.: </label>574