Lipsey, Richard G., 1928- Principles of economics / Richard G. Lipsey and K. Alec Chrystal. - 9th ed. - Oxford ; New York : Oxford University Press, 1999. - xvi, 640 p. ; 27 cm. Rev. ed. of: An introduction to positive economics. 8th ed. 1995. Includes bibliographical references. ISBN: 9780198775881 0195663489 LCCN: 98048332 Subjects--Topical Terms: Economics. Dewey Class. No.: 330