Park, K. <br/><br/>
Park's textbook of preventive and social medicine / 
K. Park 
 - 20th 
 - India  Bhanot  2009 
 - 832 p. 
<br/><br/><label>ISBN: </label>9788190607940 
<br/><br/><label>Dewey Class. No.: </label>618.1