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

 - 3rd ed. 
 - Philadelphia  Elsevier/Saunders  2004. 
<br/><br/><label>ISBN: </label>9780721603261 
<br/><br/><label>National Library of Medicine Call No.: </label>WA 105 G661e 2004