Ruffin, Roy J. <br/><br/>
Principles of economics / 
by Roy J. Ruffin. 
 - 4th ed. 
 - Glenview, Illinos :  Scott, Foresman,  c1990. 
 - xxxi, 851 p. :  ill. 
<br/><br/> Notes on subject Index. 
<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