Manheim, Jarol B., Rich, Richard C..
Empirical political analysis : research methods in political science /
with contributions by : D.L. Bahry, M.K. Brown, D.K. Ellis 
. - Englewood Cliffs  : Prentice-Hall, Inc.,  1981 
. - XX, 359 p.  24 cm. 
<br/>К.: Іл., табл. 
<br/><label>  ISBN: </label>0-13-274605-0