Gregory, Paul R. Essentials of economics / Paul R. Gregory. - 3rd ed. - New York, NY : HarperCollinsPublishers, c1996. - xiv, 211 p. : ill. ; 23 cm. Includes index. ISBN: 0673995704 LCCN: 95006441 Subjects--Topical Terms: Economics. LC Class. No.: HB171.5 / .G825 1996 Dewey Class. No.: 330