Verma, P. S., and Agarwal, V. K. <br/><br/>
Environmental Biology : 
Principles of Ecology 
 - New Delhi  S.Chand & Company Pvt. Ltd.  1983 
 - 591 
<br/><br/><label>ISBN: </label>9788121908597 
<br/><br/><label>Publisher. No.: </label> S.Chand and Company Limited 
<br/><br/><label>Subjects--Personal Names: </label> Environmental Science 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Science