Barker, David James Purslove <br/><br/>
Practical epidemiology 

 - 4th ed. 
 - Edinburgh:  English Language Book Society,  1991 
 - 173 p.;  22cm 
<br/><br/> Acc. No. 11363 
<br/><br/><label>ISBN: </label>0443044244 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiology
<br/><br/><label>National Library of Medicine Call No.: </label>WA105