Webb, Penny. <br/><br/>
Essential epidemiology :  an Introduction for students and health professionals / 
Penny Webb and Chris Bain. 
 - New York :  Cambridge Press University,  2011. 
 - 2nd ed. xiv, 443 p.  ill. ;  25 cm. 
<br/><br/> lncludes bibliographical references.  lncludes index. 
<br/><br/><label>ISBN: </label>9780521177313 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidedemiologic Methods.