Sackett, D.L.et al  . <br/><br/>
Clinical Epidemiology /   Textual Documents 

 - 2nd /   . 
 -  Little Brawn & Company ,   1991. 
 - 867 ;    
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Index Terms: </label>Medical Science  Epidemiology 
<br/><br/><label>Dewey Class. No.: </label>614.4  / SAC