Political science :  an introduction / 
Michael G. Roskin ... [et al.]. 
 - 12th ed. (Int. ed.) 
 - Boston :  Longman,  c2012. 
 - xvi, 383 p. :  col. ill. ;  23 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780205006274 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Political science.