Gordis, Leon, <br/><br/>
Epidemiology. 

 - 4th ed. 
 - Philadelphia :  Elsevier/Saunders,  2009. 
 - xv, 375 p.   ill.   26 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>9781416040026 
<br/><br/><label>LCCN: </label>2007030111 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiology.<br/>Epidemiology.<br/>Epidemiologic Methods.