CHRYSTAL, K. Alec LIPSEY, Richard G. <br/><br/>
PRINCIPLES OF ECONOMICS 

 - 9th Ed. 
 - OXFORD  Oxford University Press, Oxford   1999 
<br/><br/><label>ISBN: </label>0 19 877639 X 
<br/><br/><label>Dewey Class. No.: </label>330.1  / LIP/PR