Barker, D. J. P. <br/><br/>
Practical epidemiology / 
D.J.P. Barker, A.J. Hall. 
 - 4th ed. 
 - Edinburgh ;  New York :  Churchill Livingstone,  c1991. 
 - 173 p. :  ill. ;  22 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0443037876 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiology--Technique.
<br/><br/><label>LC Class. No.: </label>RA652  / .B37 1991