Buchanan, William,  1918- <br/><br/>
Understanding political variables 

 - 2nd ed. 
 - New York  Scribner  1974 
 - xiv, 305 p. :  ill. ;  28 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0684136546 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Political science--Mathematical models