Robert H. Fletcher, Suzanne W. Fletcher, Grant S. Fletcher <br/><br/>
Clinical Epidemiology/  The essentials. 
Robert H. Fletcher. 
 - 5th ed 
 - Philadelphia. :  Wolters Kluwer,  2014. 
 - 255p. :  ill. ; 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>1451144474 
<br/><br/><label>LC Class. No.: </label>RA 652.5  / .F54 2014