BARKER, D.J.P. <br/><br/>
Practical epidemiology 

 - Edinburgh  ELBS/Churchill Livingstone  1976. 
 - 180 p. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0-443-01932-0 
<br/><br/><label>Dewey Class. No.: </label>614.4   / BAR