Fenner, F., Henderson, D. A., Arita, I. & Jezek, Z. <br/><br/>
Smallpox and its eradication 

 - World Health Organization, Geneva  1988 
 - xvi,1460p 
<br/><br/><label>ISBN: </label>92 4 156110 6 
<br/><br/><label>Dewey Class. No.: </label>614.521 Fen