Park , J. E.  . <br/><br/>
Textbook Of Preventive and Social Medicne /   Textual Documents 

 - 13th /   . 
 - Bhanot  :   M/s Banorsidas  ,   1991. 
 - 295 ;    
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Index Terms: </label>Medical Science  Preventive and Social Medicine 
<br/><br/><label>Dewey Class. No.: </label>614  / PAR