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

 - 4th ed. 
 - U.K :  Longman group Ltd,  1991.(PGDME) 
 - 173 p. :  ill. ;  22 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0443044244 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiology
<br/><br/><label>National Library of Medicine Call No.: </label>WA 105 BP 1991