Heulbroner, Robert L.. <br/><br/>
Economics Explained /  

 - 1st ed /  
 - New Jersey-07632 :   Prentice-Hall Inc.. 
 - p256 :  
<br/><br/><label>ISBN: </label>0-13-229690-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Eonomics 
<br/><br/><label>Dewey Class. No.: </label>X  / M2