Empirical political analysis :  quantitative and qualitativeresearch methods / 
Jarol B. Manheim ... [et al.]. 
 - 7th ed. 
 - New York :  Pearson/Longman,  c2008. 
 - xii, 445 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>9780205576401 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Political science--Research.