Ruffin, Roy J. <br/><br/>
Principles of economics  
/ Roy J. Ruffin, Paul R. Gregory 
. - Dallas   : Scott , 1983
. - XXXII-798 p.  ; 26 cm. 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>0673155080 
<br/><br/><label>Source: </label> Don de l'ABBAD 
<br/><br/><label>Universal Decimal Class. No.: </label>330.13