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

 - 3rd ed. 
 - Philadelphia :  Elsevier Saunders,  2004. 
 - xi, 335 p.  ill.  24.5 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>9781416025306 
<br/><br/><label>National Library of Medicine Call No.: </label>WA 105 GE 2004