Modelski, George. <br/><br/>
Principles of world politics / 
by George Modelski. 
 - New York :  Free Press,  1972. 
 - x, 370 p. :  illus. ;  24 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>International relations.