K. Park . <br/><br/>
Park`s Text Book of Preventive & social Medicine  Textual Documents 

 - 24th ed. 
 -  M/s Banaridas Bhanot Publishers  2017 
 - 976. 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Dewey Class. No.: </label>614  / PAR