Ruffin, Roy J. <br/><br/>
Principles of microeconomics / 
Roy J. Ruffin , Paul R. Gregory. 
 - 6th ed. 
 - New York :  Addison-Wesley Educational Publishers,  c1997. 
 - xxx, 402 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780673994912 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microeconomics
<br/><br/><label>Dewey Class. No.: </label>338.5  / RUF