Gupta , Piyush  <br/><br/>
Text book of  Preventive and Social Medicine 

 - 3rd 
 -  Japee Brothers Medical Publishers 
 - 844 
<br/><br/><label>ISBN: </label>978-81-239-1921-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Medicine