Ruffin, Roy, 1938- Principles of microeconomics / Roy J. Ruffin, Paul R. Gregory. - 6th ed. - Reading, Mass. : Addison-Wesley, c1997 - 402 p. : col. ill. ; 26 cm. - The Addison-Wesley series in economics . ISBN: 0673994937 Subjects--Topical Terms: Microeconomics. Subjects--Index Terms: Kinh tế học Kinh tế học vi mô Dewey Class. No.: 338.5