Lipsey ,Richard G. An introduction to positive economics / Richard G. Lipsey and K. Alec Chrystal - 8th ed. - Oxford : ELBS with Oxford University Press, 1995. - xxiv, 919 p.: figs.,diagrs.,tables; 25 cm. Includes index ISBN: 9780198774259 0194424545 Subjects--Topical Terms: Economics --England Dewey Class. No.: 330