The presidency and the political system / 
Ed. by M. Nelson. 
 - 3rd ed. 
 - Washington :  CQ Press,  1990. 
 - IX, 551 p. ;  23 cm. 
<br/><br/>Index pp. 535-551 
<br/><br/><label>ISBN: </label>0-87187-572-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Presidents--United States