Ruffin, Roy,  1938- <br/><br/>
Principles of microeconomics / 
R.J. Ruffin, P.R. Gregory. 
 - 4th ed. 
 - Glenview, Ill. :  Scott, Foresman/Little, Brown Higher Education,  1990. 
 - 1 v. (various pagings)  ill. (some col.) ;  25 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/><label>ISBN: </label>0673460223 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microeconomics