McConnell,R.Campbell. <br/><br/>
Economics. 

 - 12th  ed. 
 - new york :  McGraw-Hill,  1993. 
 - 782  p. :  ill ;    cm. 
<br/><br/>index. 
<br/><br/><label>ISBN: </label>9780071127165 :  $ 
<br/><br/><label>Subjects--Topical Terms: </label><br/>economics.