Walton, Gary M. Understanding economics today / Gary M. Walton, Frank C. Wykoff. - 6th ed. - Boston, Mass. : Irwin/McGraw-Hill, c1998. - xvi, 496 p. : col. ill., col. map ; 24 cm. ISBN: 0256246513 9780256246513 Subjects--Topical Terms: Economics. LC Class. No.: HB171.5 / .W23 1998 Dewey Class. No.: 330