Ruffin, Roy,  1938- <br/><br/>
Principles of economics / 
Roy J. Ruffin, Paul R. Gregory. 
 - 4th ed. 
 - Glenview, Ill. :  Scott, Foresman/Little, Brown Higher Education,  c1990. 
 - xxxii, 851 p. :  ill. ;  26 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/><label>ISBN: </label>0673460207 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics.
<br/><br/><label>LC Class. No.: </label>HB171.5  / .R82 1990 
<br/><br/><label>Dewey Class. No.: </label>330