Samuelson, Paul A. Economics / Paul A. Samuelson. - 9th edition. - New York : McGraw-Hill Book Company, c1973. - xxvii, 917 pages : Illustrations ; 25 cm. Includes bibliographical references. Subjects--Topical Terms: Economics. LC Class. No.: HB171.5 / .S25 1973 Dewey Class. No.: 330