Gordis, Leon. <br/><br/>
Epidemiology / 
Leon, Gordis. 
 - 4th ed. 
 - Philadelphia, PA :  Saunders Elsevier,  2009. 
 - xv, 375 p :  ill. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>1416040026 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemological methods.<br/>Epidemology.
<br/><br/><label>LC Class. No.: </label>RA651  / .G58