Park K. , <br/><br/>
Park`s Text Book of Preventive and Social Medicine  Textual Documents 

 - 20th ed.  /   2009. 
 -  M/s Banaridas Bhanot Publishers  2009 
 - 832. 
<br/><br/><label>ISBN: </label>9788190607940   
<br/><br/><label>Dewey Class. No.: </label>614  / PAR