Gordis, Leon. <br/><br/>
Epidemiology / 
Leon Gordis. 
 - 4th  ed. 
 - Philadelphia, PA :  Saunders,  2009. 
 - xv, 375  p. 
<br/><br/><label>ISBN: </label>1416040026 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiology.