Ruffin, Roy J. <br/><br/>
Principles of economics/ 
by Roy J. Ruffin and Paul R. Gregory 
 - United State of America:  Addison-Wesley Educational Publisher,  c1996 
 - v, 706p. :  ill.;  26cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0-673-99488-0 
<br/><br/><label>Dewey Class. No.: </label>BCir. 330  / R838p