MacMahon, Brian.
Epidemiology: principles and methods /
Brian MacMahon, Thomas F. Pugh 
. - Boston : Little, Brown and company,  1970 
. - ix, 376 p.  ill., map. 
<br/>К.: Бібліогр. : c. 333-361, Index 
<br/><label>  ISBN: </label>0-316-54259-8