Ruffin,Roy J. <br/>
Principles Of Microeconomics : 
Roy J.Ruffin,Paul R. Gregory 
 - 5th ed 
 - New York :  Harper Collins College Publishers,  c1993. 
 - xx,491 p. :  24  cm. 
<br/><br/><label>ISBN: </label>0-673-46584-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics
<br/><br/><label>Dewey Class. No.: </label>338.5RUP