Manheim, Jarol B. <br/><br/>
Empirical political analysis :   quantitative and qualitative research methods / 
Jarol B. Manheim. 
 - Estados unidos:  Pearson,  2008 
<br/><br/><label>ISBN: </label>9780205576401 
<br/><br/><label>Dewey Class. No.: </label>320  / E55