Ruffin, Roy  <br/><br/>
Principles of economics / 
Roy Ruffin and Paul R. Gregory 
 - 1st ed. 
 - London :  Scott foresman and company,   1982. 
 - 798 p. :  26 cm. 
<br/><br/><label>ISBN: </label>0673155080 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Principles of economics
<br/><br/><label>Dewey Class. No.: </label>330  / RUP