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

 - 2d ed. 
 - Edinburgh ;  New York :  New York :  Churchill Livingstone ;  distributed in the U.S.A. by Longman,  1976. 
 - 180 p. :  ill. ; 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>044301471X : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiology