Political science :  an introduction / 
Michael G. Roskin ... [et al.] 
 - 12th ed. 
 - Boston :  Pearson Longman,  c2012 
 - xvi, 383 p. :  ill. (some col.) ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780205075942 (pbk.) 0205075940 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Political science