Political science :  an introduction / 
Michael G. Roskin, Robert L. Cord, James A. Medeiros, Walter S. Jones. 
 - 3rd. ed. 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  1988. 
<br/><br/><label>ISBN: </label>0136850820 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Political science.