BARKER D.J.P. <br/><br/>
Epidemiology in Medical Practice 

 - 2nd Ed 
 - New york,  ChurcHill LivingStone  1979 
 - 151p. 
<br/><br/><label>ISBN: </label>443018510 
<br/><br/><label>Dewey Class. No.: </label>616