NCERT <br/><br/>
Our Environment-7. 

 - 1st 
 - New Delhi  NCERT.  2012 
 - 77 
 -  I .
<br/><br/><label>ISBN: </label>81-7450-714-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Management.
<br/><br/><label>Dewey Class. No.: </label>333.7  / N1O