MC Gupta , <br/><br/>
Textbook of Preventive and social Medicine   Textual Documents 

 - 3rd ed.  /   2005. 
 -  Jaypee Brothers Med. Pub.  2005 
 - 646. 
<br/><br/><label>ISBN: </label>8180610705   
<br/><br/><label>Dewey Class. No.: </label>614  / GUP