Gupta; Sushma, Garg; Neeru, Aggarwal; Amita, Jaspreet; Kaur <br/><br/>
Grah vyavstha evam swasthaya vigyan  Hindi 

 - New Delhi  Kalyani publishers  2008 
 - v. pg. 
<br/><br/><label>ISBN: </label>978-81-272-4647-1 
<br/><br/><label>Dewey Class. No.: </label>640 G93G